TU516-XC 

TU516-XC 

TU516-XC 

TU516-XC 

QUALITROL IDM-T2-IDM-DAU-DFRO-U/G NSPP IDMT2IDMDAUDFROU

QUALITROL IDM-LSU-MKII NSPP IDMLSUMKII

QUALITROL 9039-0010 USPP 90390010

QUALITROL 109-119-02 USPP 10911902

Qualitrol 038-005-01 Gas Accumulation Indicator FREE SHIPPING

Qualitrol Corp. Rapid Pressure Rise Relay Model # 900-003-01

QUALITROL 108-019-01 USPP 10801901

Qualitrol AKM 35600 Pressure/Vacuum Switch FREE SHIPPING

From Canada

QUALITROL 900-009-01 USPP 90000901

# QUALITROL TEMPERATURE MONITOR MODEL# 118B-120-K-0-2

QUALITROL Flange Mount Rapid Pressure Rise Relay RPRR Model# 900-021-03 NEW

QUALITROL 208-60E, LARGE PRESSURE RELIEF DEVICE

QUALITROL 108-001-01 USPP 10800101

RAPID PRESSURE RISE RELAY 910-006-03 QUALITROL CORP

QUALITROL DAL-042-36 USPP DAL04236

Used Qualitrol Corp Temperature Monitor 111L-X-X 400009767-02

QUALITROL 3718659-G03 NSPP 3718659G03

电子技术是十九世纪末到二十世纪初开始发展起来的新兴技术，二十世纪发展迅速，应用广泛，成为近代科学技术发展的一个重要标志。在十八世纪末和十九世纪初的这个时期，由于生产发展的需要，在电磁现象方面的研究工作发展得很快，1785年法国科学家库伦由实验得出电流的库仑定律。1895 年，荷兰物理学家亨得里克·安顿·洛伦兹假定了电子存在。1897年，英国物理学家汤姆逊（J.J.Thompson）用试验找出了电子。1904年，英国人J.A.Fleming 发明了简单的二极管(diode或 valve)，用于检测微弱的无线电信号。 1906 年，L.D.Forest 在二极管中安上了第三个电极（栅极，grid）发明了具有放大作用的三极管，这是电子学早期历史中重要的里程碑。1948 年美国贝尔实验室的几位研究人员发明晶体管。1958 年集成电路的第一个样品见诸于世。集成电路的出现和应用，标志着电子技术发展到了一个新的阶段。

电子技术研究的是电子器件及其电子器件构成的电路的应用。半导体器件是构成各种分立、集成电子电路基本的元器件。随着电子技术的飞速发展，各种新型半导体器件层出不穷。现代电力电子技术的发展方向，是从以低频技术处理问题为主的传统电力电子学，向以高频技术处理问题为主的现代电力电子学方向转变。电力电子技术起始于五十年代末六十年代初的硅整

电子产品

电子产品

流器件，其发展先后经历了整流器时代、逆变器时代和变频器时代，并了电力电子技术在许多新领域的应用。八十年代末期和九十年代初期发展起来的、以功率MOSFET和IGBT为代表的、集高频、高压和大电流于一身的功率半导体复合器件，表明传统电力电子技术已经进入现代电力电子时代。

Qualitrol DAL-042-49 DAL04249 Level Gage - Used

Qualitrol Pressure / Vacuum Gauge 050-011-01

From Canada

QUALITROL 1050-35K USPP 105035K

QUALITROL 250 ELECTRONIC ANALOG TEMPERATURE CONTROLLER MODEL 107-002-01 **XLNT**

QUALITROL 48515-1 Power Supply NEW

Qualitrol Air Pressure Relief Valve 5 PSIG 201-020-08T

QUALITROL 108-018-01 ELECTRONIC TEMPERATURE MONITOR CONTROLLER 69597

QUALITROL 108-018-01 ELECTRONIC TEMPERATURE MONITOR CONTROLLER 69691

QUALITROL 108-018-01 ELECTRONIC TEMPERATURE MONITOR CONTROL 277V 69692

QUALITROL CORP. LARGE PRESSURE RELIEF DEVICE, 208-60S, 12 PSI, 0.83 BAR, 410725

QUALITROL PRESSURE RELIEF DEVICE, 208-60S, 12 PSI, 0.83 BAR, 410727, 06/23/08

NEW QUALITROL 208-60U LARGE PRESSURE RELIEF DEVICE 8PSI 68714

Qualitrol /ITE QualTherm Liquid Temprature Gauge 0-120C

NEW QUALITROL TRANSFORMER OIL FLOW METER INDICATOR N/R!

QUALITROL 165-50-12J QUALITHERM 0-120C DEG. TEMPERATURE GAUGE BRASS 4.5IN 57492

QUALITROL PRESSURE VACUUM SWITCH VALVE BOX#33

PITTMAN PG6313A014-R3 3098511-02 CNC MOTOR ENCODER 4.5V 16:1GR 309581102

PITTMAN PG6313A010-R4 3098512-02 16CPR CNC ENCODER MOTOR 309851202

Pittman DC gearhead motor NEVER USED! 15vDC

Pittman - Model #GM9413-1 - 12-VDC Gearhead Motor, with a 5.9 to 1 Ratio

Pittman 4400 series, 24VDC, 200CPR, brushless motor

Pittman 400 RPM Gearhead Precision Motor - 24V - GM8513

1941 Ad Allison Aircraft Military Motors World War II Bomber Art Hobson Pittman

One-day shipping available

Newly listedPittman Ametek Motor Tach Gripper 24VDC 96 CPR - IBM 24R0877 H81963

PITTMAN PG6713A046-R3 MOTOR ENCODER 7.58V 3.7:1GR W/ SCREW DRIVE

New Ametek / pittman GM8222D314-R3 24 VDC GEAR MOTOR

Pittman 800 RPM Gearhead Precision Motor - 24V - GM8714 - 10:1 Gear Ratio

Newly listedPITTMAN servo motor with HP encoder 30.3V DC, CNC automalition route

PITTMAN 7212C109 DC SERVO MOTOR 19.1 VDC

Pittman 82 RPM Gearhead Precision Motor - 19V - GM8712

Pittman 9534 Motor - 76.5V - High Torque Precision 7 Pole Motor - 6,100 RPM

AMETEK PITTMAN 9213C129-R2 W700053 48 VDC Servo Motor New!

REVELL MOTOR SPORTS K.S. PITTMAN WILLYS DRAG COUPE 1/25 MODEL KIT

REVELL MOTOR SPORTS K.S. PITTMAN WILLYS DRAG COUPE 1/25 MODEL KIT 854990

PITTMAN #9213C259 DC SERVO MOTOR 24VDC 3600 RPM (2EA)

Newly listedPITTMAN LOCOMOTIVE MOTOR FOR O SCALE BRASS#5

NEW PITTMAN GM8712-31 GEAR MOTOR

Vintage Slot Car Racing Motor,Revell -Pittman RP7 1965 in original box R1097:500

VINTAGE PITTMAN 6 VOLT MOTOR FOR RC BOAT MODEL

PITTMAN GM9237E617-R7 12 VDC 19.7:1 RATIO Motor

PITTMAN DC70-6 5-POLE ELECTRIC MOTOR (NOS) w BOX , MOUNTING SCREWS & PAPERWORK

CNC adapter plate for pittman motor to NEMA 23 aluminum

PITTMAN GM8714F687 GEARHEAD PRECISION MOTOR 24VDC 31.1 RATIO 24 DC

Newly listedPittman 24VDC gear motor 10:1 ratio. automation

1960's Revell-Pittman RP66 SLOT CAR Racing Motor MIB

Pittman 8 RPM Gearhead Precision Motor - 12V DC - GM8712 - Extreme Torque Output

Aurora K&B Brass Motor Mount for Pittman 704, #1101 MOC

Pittman Precision Motor - 3700 RPM - 12V - Pittman 8224

Pittman 9534 Motor Armature - 76.5V - 7 Pole Armature - Laminated Core

PITTMAN 9436K030-R2 12 VDC MOTOR

From Israel

Vintage Japanese slot car motor Pittman DC705 clone