|
US2578431A
|
|
Vertical lift control system
|
|
US2507791A
|
|
Vertical lift control system
|
|
US2370546A
|
|
Multiple-car dumb-waiter system
|
|
US2433763A
|
|
Gate and interlock for elevators
|
|
US2373029A
|
|
Mechanism for dispensing stacked articles
|
|
US2411882A
|
|
Elevator system
|
|
US2309123A
|
|
Elevator guide means
|
|
US2237232A
|
|
Dumbwaiter biparting door coupling means
|
|
US2188357A
|
|
Dumb-waiter control system
|
|
US2156295A
|
|
Elevator door mechanism
|
|
US1876302A
|
|
Cable equalizing mechanism
|
|
US1901520A
|
|
Elevator track mounting
|
|
US1702783A
|
|
Elevator guide means
|
|
US1511171A
|
|
Dumb-waiter
|
|
US1435859A
|
|
Hoisting apparatus
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