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A20B-8100-0821
A20B-8100-0821
A20B-8100-0821
SIEMENS可编程控制器,ABB可编程控制器,SIEMENS PLC控制系统,ABB PLC控制系统,交直流传动装置,传动技术应用,伺服控制系统|数控备品备件,人机界面及网络/软件,工业机器人备件
那么大, 我想去看看。
产品那么多, 我要买工控。
工控产品全, 要问哪家好。
哪家都很贵, 还是大德强。
产品库存多, 况且有。
模块 P L C, 伺服触摸屏。
伺服驱动器, 工业 D C S。
工控可编程, 变频可调式。
人机显示全, 伺服能定位。
客户都来选, 选好要付款。
款到就发货, 快递送到家。
客户收到货, 发随后到。
合同生效起, 质保是一年。
期间有问题, 15天包退换。
都是原装货, 客户请放心。
真诚做买卖, 服务于客户。
信誉靠什么, 一是靠价格。
二是靠质量, 三是靠服务。
我们三原则, 发展集团化。
主营AB,ABB,GE,施耐德,西门子等进口自动化配件,欢迎咨询采购
HITACHI 2-823753-*A TUBE, FLEX HE LINE
HITACHI 2-823753-B Flexible Tube
HITACHI 2-823927-01 TWO STEP VALVE KD4TS-VC
HITACHI 2-824035-A COVER,V1,CE,MARKED
HITACHI 2-824206-A PCB, BBMXC-1
HITACHI 2-824470-3 SENSOR, AMPLIFIER, GV2, JIG
HITACHI 2-824470-C SENSORHEAD,GV2
HITACHI 2-824669-B KIT, REPLACEMTNT, GV2,JIG
HITACHI 2-824669-C SENSOR FIBER GUIDE ASSY
HITACHI 2-824669-C SENSOR FIBER GUIDE ASSY
HITACHI 2-824898-B RF TUBE ASSEMBLY
HITACHI 2-825485-B RING
HITACHI 2-825846-21 O-RING,G300
HITACHI 2-826156-A KIT, LOADLOCK, STAGE
HITACHI 2-826159-A KIT,LOADLOCK,STAGE
HITACHI 2-826159-E KIT,UNLOAD,LOCK,STAGE
HITACHI 2-826376-A VALVE V1 ASSY CEMARK
HITACHI 2-826984-90 ELECTRODE, GRD, UPPER, DOMESTIC M712
HITACHI 2-827312-A CONNECTOR, W/CABLE
HITACHI 2-827591 BUTTERFLY VALVE
HITACHI 2-827591-01 VALVE BUTTERFLY
HITACHI 2-828273-01 PEN RECORDER
HITACHI 2-828521-01 QUARTZ FIBER (L=915)
HITACHI 2-828670-^A WAFER,PUSHER
HITACHI 2-828807-A FLOW METER
HITACHI 2-A01046-01 CONDUCTOR RING
HITACHI 2-A01862-03 BASE FRANGE SKIRT
HITACHI 2-A01971-01 INSULATOR RING
HITACHI 2-A01972-01 INSULATOR RING
HITACHI 2-A03223-*A RING EARTH ADOPTION
HITACHI 200VX1.5KW V/D HEATER
HITACHI 225-0040 AUTO SOFT VALVE NW40 ISO-KF
HITACHI 231-7754 POWER SUPPLY CA40012V33AJ40009
HITACHI 271-0011 CDSEM CIRCUIT BOARD ASSY EBSI 100 (LPO/C
HITACHI 271-2863 ECPU 263 BOARD
HITACHI 271-3162 CPU,BACK-UP
HITACHI 28182251 SHOWER HEAD
HITACHI 29K00003 16 CHANNEL ANALOG MULTIPLEXER PCB
HITACHI 29K00006 PCB ADC-30 KRYTEK
HITACHI 29K00007 PCB, ADC-25, KRYTEK
HITACHI 29K00008 PCB PIO-48D
HITACHI 29K00010 DIGITAL TO ANALOG PCB
HITACHI 2SD555 TRANSISTOR (PACK OF 10)
HITACHI 3-812554-A BATTERY
HITACHI 3-812922-05 BELLOWS FLANGE(ASHING CHAMBER)
HITACHI 3-814170-06 Potionmeter
HITACHI 3-814170-08 Potentiometer
HITACHI 3-814170-09 Potentiometer
HITACHI 3-814447-B FILTER 396NM
HITACHI 3-814447-M FILTER 451NM
HITACHI 3-816404-RevC FLEXIBLE TUBE ( LOWER ELECTRODE )
HITACHI 3-817830-1 SLEEVE GAS M-216A
HITACHI 3-818280-1 BUSH
HITACHI 3-819176-02 SWITCH
HITACHI 3-819580-1 MAGNETRON 2M121A
HITACHI 3-819580-1 MAGNETRON 2M121A
HITACHI 3-819580-A MAGNETRON 2M121A
HITACHI 3-819718-A GLASS, FIBER
HITACHI 3-819728-A BELLOWS,ER,ASSY
HITACHI 3-819728-RevA BELLOW FLANGE ( ER BELLOWS )
HITACHI 3-821414-03 PEN-RECORDER PAPER
HITACHI 3-821491-B MOTOR, DRIVER
HITACHI 3-821529-A SENSOR, PHOTO, EE-SPY-401
HITACHI 3-821577-16 O-RING G250
HITACHI 3-821688-A VALVE, SOLENOID
HITACHI 3-821697-01 BELLOWS FLANGE(BUFFER& LOADLOCK
HITACHI 3-821697-B BELLOWS ASH EXH
HITACHI 3-821697-B BELLOWS ASH EXH
HITACHI 3-821733-01 LIMIT SWITCH, SS-5GL2-F
HITACHI 3-822287-A L-TYPE VALVE
HITACHI 3-822287-A L-TYPE VALVE
HITACHI 3-822518-1 SHAFT FOR M308-ATW
HITACHI 3-822518-A SHAFT WAFER PUSHER ETCH
HITACHI 3-822555-01 INSULATOR RING
HITACHI 3-822555-A INSULATING RING
HITACHI 3-823123-07 ORING,PERFLUORO,P25
HITACHI 3-823123-08 ORING,PERFLUORO,P14
HITACHI 3-823123-11 ORING,P50,PERFLOUR L-VALVE
HITACHI 3-823139-1 WAFER CATCH
HITACHI 3-823139-A WAFER,PUSHER,ETCH
HITACHI 3-823140-2 WAFER CATCH ( 5")
HITACHI 3-823295-F MAGNETRON 2M121A-59A
HITACHI 3-823395-A PHOTO ROUND SEAT
HITACHI 3-823439-A AIR CYLINDER
HITACHI 3-823794-B TUBE,FLEXIBLE,SS,CAJON
HITACHI 3-823842-C VALVE AIR OPERATED OHNO
HITACHI 3-824007-A FLEXABLE TUBE FOR E/C EXHAUST
HITACHI 3-824007-E FLEX TUBE
HITACHI 3-824183-03 VALVE,AIR-OPERATED, N/O TYPE
HITACHI 3-824295-04 PLAIN BEARING
HITACHI 3-824769-B FLOW CHECKER
HITACHI 3-825095-B+E SENSOR
HITACHI 3-825202-1 SPLITTER,MONITOR
HITACHI 3-825221 CONVERSION FLANGE
HITACHI 3-825593-02 RF MATCH UNIT LP-500-800KB-B
HITACHI 3-825755-A EARTH
HITACHI 3-826042 SPACER
HITACHI 3-827428-05 AS568-260 O-RING.
HITACHI 3-827428-12 AS568A-276- O-RING
HITACHI 3-827452-002 SLEEVE ( AL L TYPE EARTH )
HITACHI 3-827452-2 SLEEVE
HITACHI 3-8276276-06 O-RING V70
HITACHI 3-827667-00 O-RING
HITACHI 3-827667-03 O-RING
HITACHI 3-827667-06 O-RING P-3
HITACHI 3-827667-07 O-RING
HITACHI 3-827667-17 O-RING P18
HITACHI 3-827668-03 O-RING P250
HITACHI 3-827673-06 O-RING, G50 VITON.
HITACHI 3-827674-04 O-RING G-145
HITACHI 3-827674-16 O-RING, G210 VITON
HITACHI 3-827674-20 O-RING G-250
HITACHI 3-827674-21 O-RING G-260
HITACHI 3-827676-03 O-RING, V34 VITON
HITACHI 3-827676-15 O-RING
HITACHI 3-827676-16 O-RING V-430
HITACHI 3-827676-18 O-RING V530
HITACHI 3-827676-21 O-RING,V690 VITON.
HITACHI 3-827677-04 O-RING,V950
HITACHI 3-827900-A SWITCH VACUUM N2PUFFER
HITACHI 3-828116-E TUBE, FLEXIBLE, SS
HITACHI 3-829078-A VALVE, L-TYPE, V9
HITACHI 3-829146-01 PHOTO SENSOR
HITACHI 3-829146-02 PHOTO SENSOR
HITACHI 3-829224-02 O-RING
HITACHI 3-829224-04 O-RING P14, NBR
HITACHI 3-829224-10 O-RING P28
HITACHI 3-829303-10 SOCKET HEAD SCREW M4X14
HITACHI 3-829305-05 SOCKET HEAD SCREW
HITACHI 3-831625001 FILTER
HITACHI 3-831626001 RINSE FILTER
HITACHI 3-832525-10 ORING,G65,PERFLUORO L-VALVE
HITACHI 3-832525-11 O-RING, G220(BLACK)PERFLUORO
HITACHI 3-832526-09 O-RING AS568A-381
HITACHI 3-832526-12 SHUTTER GATE O RING
HITACHI 3-832708-A Base
HITACHI 3-832735-01 SHAFT, PLYC X
HITACHI 3-832745-02 SOCKET HEAD SCREW
HITACHI 3-832745-03 SOCKET HEAD SCREW M3X12
HITACHI 3-832746-05 SOCKET HEAD SCREW M4X8
HITACHI 3-832751-A Base
HITACHI 3-832776-01 O-RING AS568A-280
HITACHI 3-832776-02 ORING,AS568-381,PE
HITACHI 3-832776-03C O-RING, A-ch SLEEVE
HITACHI 3-832776-04 O-RING AS568A-384
HITACHI 3-832776-07 ORING,AS568-275,PE
HITACHI 3-832777-04 O-RING G240 PERGLUORO
HITACHI 3-832777-04(-*D) O-RING, A-ch QUARTZ PLATE
HITACHI 3-832983-C FLEXIBLE TUBE
HITACHI 3-833337-A SWITCH,ATM
HITACHI 3-833342-4 COIL TUBE (AT4-06)
HITACHI 3-833469-01 LOWER,ER,COVERS
HITACHI 3-833469-01 LOWER,ER,COVERS
HITACHI 3-833535-1 GENERATOR, RF, RP-300-2MX-C
HITACHI 3-833535-1 GENERATOR, RF, RP-300-2MX-C
HITACHI 3-833620-B GEAR,WORM,UNIT
HITACHI 3-833625-01 PHOTO SENSOR
HITACHI 3-833717-01 ER, BASE
HITACHI 3-833717-01 ER, BASE
HITACHI 3-833923-B FLANGE
HITACHI 3-834066-01 Sheet
HITACHI 3-834150-A PIPE, GAS, FILTER
HITACHI 3-834423-01 SHIELD, EARTH
HITACHI 3-834423-01 SHIELD, EARTH
HITACHI 3-834527-01 WAFER HOLDER
HITACHI 3-834569-01 SUPPORT
HITACHI 3-834570-01 SUPPORT
HITACHI 3-834580-01 WAFER SUPPORT
HITACHI 3-834902-01 GAS RING
HITACHI 3-835024-02 HEATER
HITACHI 3-835026-01 THERMOCOUPLE
HITACHI 3-835067-01 ELECTROIC THERMO (5L-A1)
HITACHI 3-835067-02 ELECTROIC THERMO (5L-A1)
HITACHI 3-835085-A CYLINDER,LPS
HITACHI 3-835086-01 O-RING
HITACHI 3-835086-03 O-RING
HITACHI 3-835236-A PIPE EC CM #2
HITACHI 3-835237-B PIPE
HITACHI 3-835303-01 REGULATOR, N2 PURGE
HITACHI 3-835488-2 GENERATOR, DC
HITACHI 3-83620500-3 BLOCK COVER
HITACHI 3-836228-01 PORT,VIEW
HITACHI 3-836497-C WARM WHEEL KIT
HITACHI 3-836508-03 VACUUM, ROBOT ARM
HITACHI 3-836509-02 PHOTO SENSOR
HITACHI 3-836510-01 PHOTOELECTRIC SWITCH
HITACHI 3-836510-06 PHOTO SWITCH
HITACHI 3-836716-*B AIR CYLINDER ASSY
HITACHI 3-837105-001 SLEEVE (ALL TYPE EARTH)
HITACHI 3-837248-1 FAN COOLING FOR M216A D.C. POWER SUPPLY
HITACHI 3-837297001 CYLINDER
HITACHI 3-837424-01 O-RING
HITACHI 3-837424-04 O-RING AS568A-382 VITON
HITACHI 3-837424-06 O-RING
HITACHI 3-837424-13 O-RING, AS568A-241 VITON
HITACHI 3-837426-04 SPRING PIN
HITACHI 3-837428-05 O-RING AS568A-267
HITACHI 3-837428-09 O-RING
HITACHI 3-837428-12 O-RING AS568-276 VITON
HITACHI 3-837467-01 O-RING (REPLACED BY 4-820960-01)
HITACHI 3-837672-1 COMPUTER,B32,4OMEGA,HARD
HITACHI 3-837672-1/R COMPUTER, B32, 4OMEGA, HARD
HITACHI 3-837875-01 VIEW PORT
HITACHI 3-837902-01 RING, GAS
HITACHI 3-838186-02 GAS RING
HITACHI 3-838423-05 GROUNDED ELECTRODE
HITACHI 3-838448-A KIT HICON WET CLEAN
HITACHI 3-839133-01 INSULATION SHEET
HITACHI 3-839133-02 INSULATION SHEET
HITACHI 3-839339-A THIN CYLINDER (HIGHT-FIELD/FRONT)
HITACHI 3-839339-B THIN CYLINDER (HIGHT-FIELD/BACK)
HITACHI 3-840400-02 PCB, I/O UNIT FOR BASE
HITACHI 3-840517-RevA AIR CYLINDER (CDQ2KB20-01-92320)
HITACHI 3-841707-01 ROD SUPPORT, ER SHAFT
HITACHI 3-842011-01 WAFER SUPPORT
HITACHI 3-842088-04 PCB, 10TC-02 VME MICRO COMPUTER
HITACHI 3-842095-02 PCB, 10TV-01A,I/O UNIT FOR BASE.
HITACHI 3-842099-A PCB, RYB308X-2
HITACHI 3-842100-02 ETCHER PCB
HITACHI 3-842101-02 PCB, A10-02, I/O UNIT FOR BASE
HITACHI 3-842612-01 PANEL MOUNT INSTRUMENTATION PIPING
HITACHI 3-844213-05 AS568A-382 O-RING
HITACHI 3-844743-A AIR HYDROCYLINDER (MODEL : MGQL20-B4377)
HITACHI 3-845059-A SPRING, CLAMP, P856, 4 PACK
HITACHI 3-848367-A P858, GV1, PM-KIT
HITACHI 3-848367-A P858, GV1, PM-KIT
HITACHI 3-848419-A PRESSURE SWITCH.
HITACHI 3-848420-A PRESSURE SWITCH
HITACHI 3-848422-A DIGITAL PRESSURE GUAGE T60A36
HITACHI 3-848474-A FLOW METER W/CONNECTOR
HITACHI 3-848507-01 GAS,RING,LOWER
HITACHI 3-849970-$$A KIT,HICON,WETCLEAN,P856,M3X6
HITACHI 3-850135-^A VALVE, LEAK
HITACHI 3-850138-A CYLINDER
HITACHI 3-850223-01 INSULATOR RING
HITACHI 3-85137-*A OPTO, ELECTRONIC SW
HITACHI 3-85138-*A OPTO, ELECTRONIC SW
HITACHI 3-851389-A KIT HICON WET CLEAN CONS 858
HITACHI 3-864559-B Heater Jacket
HITACHI 3-A00357-90 QUARTZ SLEEVE
HITACHI 3-A00357-90 QUARTZ SLEEVE
HITACHI 3-A03069-01 SPACER RING
HITACHI 3200282 SOLENOID VALVE 12VDC(ET-3M-12FORGSD'S
HITACHI 3ROT002834 CLAMP, FORELINE, PIPE
HITACHI 4-808625-B SHIELD LINE BUFFER LID
HITACHI 4-813027-1 UPTHRUST SEAT
HITACHI 4-813670-A TIMING BELT
HITACHI 4-815165-1 LOW SEAT M4
HITACHI 4-815612-001-A00597AG METAL O-RING
HITACHI 4-816920-001 SPECIAL BUSH ( SHORT )
HITACHI 4-817494-2 CASE HEAT MICRO
HITACHI 4-817835-001 PERFORATED METAL
HITACHI 4-818072-01 ELECTRIC CONDUCTOR
HITACHI 4-818402-001 SPECIAL BUSH ( LONG )
HITACHI 4-819188001 SLIDE SHAFT PIN
HITACHI 4-819370-02 AHI GASKET 4-819370-02 AHI
HITACHI 4-819837-01 PIN FOR SUPPORT
HITACHI 4-819868-01 SPECIAL BOLT APC VALVE
HITACHI 4-819975-01 SHAFT
HITACHI 4-820504-02 RING
HITACHI 4-821592-1 BLOCK COVER
HITACHI 4-824473001 CHECK
HITACHI 4-825363-001 AIR CYLINDER (JDAS16X10-B )
HITACHI 4-825811-01 DETECTOR
HITACHI 40595 HEATED OBJECTIVE APERTURE
HITACHI 433-3659 SUPPORT
HITACHI 4452-PT3/8 VALVE, HAND, 4452-PT3/8"
HITACHI 533-1001 END APERTURE
HITACHI 533-1101 SWITCH
HITACHI 537-7010 HIGH VOLTAGE TRANSFORMER T3
HITACHI 545-0117 OBJ,APERTURE ASSY
HITACHI 545-1101 PCB INTERFACE
HITACHI 545-1114 APERTURE,OBJECTIVE,LENS
HITACHI 545-1148 PADS RUBBER
HITACHI 545-1388 UNION NUT
HITACHI 545-1389 RING
HITACHI 545-1510 GEAR,
HITACHI 545-4454 APPERTURE PLATE
HITACHI 545-4462 PLATE OBJECTIVE LENS APERTURE LARGE S7000
HITACHI 548-5503 ST CONT SUB PCB
HITACHI 549-5963 MO DRIVE
HITACHI 54K00037 RELAY 3PDT24VDC15AMP SOCKET MOUNT
HITACHI 560-0069 ARMS;A,B transfer for 9200
HITACHI 560-0402 LID(LD)
HITACHI 560-1012 AV2 CYLINDER FOR 9200
HITACHI 560-1069 SENSOR ST3-T
HITACHI 560-1070 W2T SENSOR ASSY
HITACHI 560-1089 SENSOR LD ASSY
HITACHI 560-1866 CDSEM LD O-ring 568-372
HITACHI 560-4870 COVERED BEARING
HITACHI 560-5118 STAGE CONTROLLER
HITACHI 565-1052 O-RING AV2
HITACHI 566-1351 APERTUNE PLATE
HITACHI 566-1939 ARM,CERAMIC,TRNFR,S6600
HITACHI 566-2405 PLATE - APETURE .03 X 4 MM
HITACHI 566-5534 CIRCUIT BOARD ASSY PE HV
HITACHI 567-0036 WAFER HANDLING ARM
HITACHI 567-0317 RING
HITACHI 567-0325 LD COVER
HITACHI 567-0334 EXCHANGE ARM SCREW (CD-SEM)
HITACHI 567-0383 SUPPORT PLATE
HITACHI 567-0410 HEATER,INNER,BAKE
HITACHI 567-0552 SUPPORT PLATE
HITACHI 567-0632 SENSOR TRANSMITTER (CD-SEM)
HITACHI 567-0633 SENSOR RECEIVER (CD-SEM)
HITACHI 567-0703 WAFER TRANSFER(CtoC)
HITACHI 567-0703-OM MOTOR, THETA-MOTOR
HITACHI 567-0703-XM PCB, X DRIVE PCB FOR UTC-820Z
HITACHI 567-0759 MOTOR (R-A)
HITACHI 567-0760 MOTOR (R-B)
HITACHI 567-0781 ROLLER,ROLLER HOLDER ASSY
HITACHI 567-0790 VALVE ASSY AV2
HITACHI 567-0842 PALETTE U/D ASSY
HITACHI 567-0845 AMPLIFIER FOR SENSOR (CD-SEM)
HITACHI 567-0942 LASER DIODE UNIT567-0942(CD-SEM)
HITACHI 567-0980 UP LIFT METAL STATION PELLET
HITACHI 567-1128 COUPLING, ML-27-6
HITACHI 567-1168 AV2 ROLLER BEARING (CD-SEM)
HITACHI 567-1178 SUPPORT
HITACHI 567-1300-OM 8840 Q MOTOR
HITACHI 567-1300-XM 8840 X MOTOR
HITACHI 567-1300-ZM 8840 Z MOTOR
HITACHI 567-1488 LAMP, HALOGEN (NISSEI SANGYO)
HITACHI 567-1510 BEVELGEAR (CD-SEM)
HITACHI 567-1763 ARM BASE A
HITACHI 567-1764 ARMS BASE B
HITACHI 567-2437 SPECIMEN,STANDARD,REFERENCE
HITACHI 567-2508 SCREW AV2 BEARING
HITACHI 567-3072 RING,PORCELAIN,PUSH
HITACHI 567-3374 ARM, CHANGE
HITACHI 567-3541 AMPLIFIER
HITACHI 567-4168 O-RING AV3
HITACHI 567-5113 STAGE CONTROLLER UNIT
HITACHI 567-6780 REMOTE CABLE
HITACHI 567-6887 ETHERNET SWITCH SW507 HOPPER
HITACHI 567-8706 PIPE RUBBER
HITACHI 567-8707 PIPE RUBBER
HITACHI 567-8711 ARM, C-T-C, WAFER
HITACHI 5670767 CYLINDER,LD CYLINDER
HITACHI 5673374 ARMS;A,B transfer for 8840
HITACHI 568-4500 GAS FILTER
HITACHI 568-5510 NSGVA PCB
HITACHI 568-5512 EDCONT PCB
HITACHI 568-5513 CIRCUIT BOARD ASSY LENS
HITACHI 568-5569 NPSDAMP
HITACHI 568-5591 SIP PCB
HITACHI 569-2799 ELECTROMAGNETIC VALVE
HITACHI 569-4066 I TAPER BEARING
HITACHI 580-3427 BAKE CLAMP
HITACHI 580-4614 FILTER,N2
HITACHI 580-5207 TERMINAL
HITACHI 580-5443 APERATURE PLATE LARGE S6000
HITACHI 583-1602 APERTURE PLATE
HITACHI 585-4496 PLATE, APERTURE
HITACHI 588-6502 ROTARY ENCODER
HITACHI 589-3565 SCINTILLATOR, 10MM
HITACHI 58K00001 VALVE THREE WAY N.C.1/824VDCSINGLE
HITACHI 60C/60B AR+LASER POWER SUPPLY
HITACHI 60K00013 LAMP 24VDC
HITACHI 64K00005(G4IDC5) RELAYI NPUT G4IDC5
HITACHI 64K00006(G4ODC5) RELAY OUTPUT G4ODC5
HITACHI 6500554 FLOWSWITCH N2(LPH-2507A)
HITACHI 6818ZZ BEARING 6818ZZ
HITACHI 6824VV BEARING
HITACHI 6826VV BEARING 6826VV
HITACHI 691-0707 XY STAGING COUPLING
HITACHI 691-0753 X MOTOR
HITACHI 691-7792 ROLLER MOTOR (LD)
HITACHI 757-1063 DIAPHRAGM ,0.7
HITACHI 825-4388 WATER COOLKING ASSY
HITACHI 887-PK-001 CERAMIC ROBOT
HITACHI 912-F1002-30 FILTER,30 MICRON
HITACHI 91320-55001 VACUUM GAUGE PKR-251DN40ISO-KFFULL
HITACHI 9635 J12A37 CARTRIDGE HEATER
HITACHI A008-2 PCB
HITACHI AB-41-02-5-R3A SOLENOID VALVE
HITACHI ABN111 PUSH BUTTON SWITCH ABN111
HITACHI ADC1102 ANALOG DEVICE A/D-C 1102
HITACHI AFMO-40-14E-W AUTOBALL VALVE AFMO-40-14E-W
HITACHI AH0007 BATTERY FOR NUPS-500
HITACHI AH0039 CONNECTOR
HITACHI AI16-2 PCB