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