US1620430A
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Operating mechanism for shaft doors
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US1626383A
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Illuminated signal for elevator installations
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US1636895A
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Electric switch
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US1568954A
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Illuminated directional signal for elevators
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US1706869A
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Elevator signaling system
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US1481119A
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System for controlling the operation of elevators
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US1350698A
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Elevator-door lock
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US1400721A
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Door-opening device and lock for elevator-doors
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US1367854A
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Emergency-switch protector
|
US1295102A
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Wind-shield.
|
US1346111A
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Combined locking and circuit-controlling device for double doors
|
US1333241A
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Electric switch
|
US1333240A
|
|
Elevator signaling system
|
US1413570A
|
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Combined elevator-door-locking and circuit-controlling device
|
US1165383A
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Elevator-indicator system.
|
US1089310A
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Elevator-indicator.
|
US1037113A
|
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Elevator-indicator.
|