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US2062432A
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Elevator operating apparatus
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US1969435A
|
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Electromagnetically controlled brake
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US2080842A
|
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Slow speed regulation of an electric motor
|
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US1937136A
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Automatic floor leveling equipment for elevators
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US1937102A
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Movement governor for generator voltage control
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US1860394A
|
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Adjustable brake stand
|
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US1875118A
|
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Elevator safety device
|
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US1797512A
|
|
Elevator control device
|
|
US1738215A
|
|
Travel-control device for elevators
|
|
US1744823A
|
|
Door-operating mechanism
|
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US1714285A
|
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Elevator control
|
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US1691915A
|
|
Switch-operating mechanism
|
|
US1585519A
|
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Multispeed-motor protection
|
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US1754779A
|
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Dynamo-electric control system
|
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US1736390A
|
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Swing-door-operating mechanism
|
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US1573140A
|
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Landing doorlock
|
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US1661022A
|
|
Alternating-electric-current control system
|
|
US1553204A
|
|
Elevator-operation device
|
|
US1549166A
|
|
Elevator control device
|
|
US1570101A
|
|
Hoisting and lowering control mechanism
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