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1886-10-19 |
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Territory |
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1938-10-15 |
1942-03-17 |
Vickers Inc |
Power saving pump jack
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1940-01-06 |
1944-04-04 |
American Telephone & Telegraph |
Phase control in electrical transmission
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GB652558A
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1948-09-24 |
1951-04-25 |
Ferranti Ltd |
Improvements relating to moving-coil voltage regulators
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IT579083A
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1956-10-25 |
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GB1046446A
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1962-05-16 |
1966-10-26 |
Brentford Electric Ltd |
Improvements in or relating to electric regulation systems
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1965-12-28 |
1969-04-22 |
Texaco Inc |
Electric motor control system for a beam type pumping load
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1967-12-07 |
1969-09-30 |
Nasa |
Positive dc to negative dc converter
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1968-01-12 |
1969-09-30 |
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Positive dc to positive dc converter
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1968-09-11 |
1971-05-18 |
Texas Petroleum Co |
Downhole producing pump
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1968-12-20 |
1970-08-04 |
Nasa |
Transistor servo system including a unique differential amplifier circuit
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1969-03-13 |
1971-06-01 |
Ford Motor Co |
Circuit impedance measuring device employing clamp on magnetic current sensor
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1969-08-28 |
1970-11-17 |
Nasa |
Brushless direct current tachometer
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1971-03-11 |
1973-06-19 |
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A.c. motor drive circuit
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1971-04-13 |
1973-02-27 |
Borg Warner |
Variable speed plural motor control system with incremental speed synchronization
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1971-06-21 |
1972-06-20 |
Floyd E Kingston |
Three-phase power controller
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1971-08-12 |
1973-08-21 |
Us Air Force |
Light pressure operated microbalance system
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1973-02-12 |
1976-04-27 |
Delta-X Corporation |
Control circuit for shutting off the electrical power to a liquid well pump
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1973-08-06 |
1974-12-03 |
M Mills |
Pump-off control apparatus for a pump jack
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1973-12-19 |
1975-01-14 |
Nasa |
Variable frequency inverter for ac induction motors with torque, speed and braking control
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1975-04-30 |
1976-05-25 |
General Electric Corporation |
Static controller for power factor correction and adaptive filtering
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1975-08-29 |
1976-08-24 |
Square D Company |
Dual channel dynamic line isolation monitor
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1976-01-14 |
1977-10-04 |
Bird Oil Equipment, Ltd. |
Pump jack
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1976-03-18 |
1977-08-02 |
The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration |
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1976-06-04 |
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Ferranti Ltd |
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1976-07-19 |
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Power factor control system for ac induction motors
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1977-05-23 |
1978-06-20 |
The Valeron Corporation |
Power monitor
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1977-08-10 |
1979-03-20 |
Standard Oil Company (Indiana) |
Speed control
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1979-09-18 |
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Energy demand controller and method therefor
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Preparatio of iminodiacetic acid
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Superior Electric Supply Co. |
Automatic load seeking control for a pumpjack motor
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Power factor control system for AC induction motors
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Power factor control of a three-phase induction motor
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Cynex Manufacturing Corporation |
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Sony Corporation |
Input transformer circuit
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AC voltage regulator with split primary switching
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Phase controlled regulator
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Board Of Regents Of The University Of Washington |
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