|
US1756459A
|
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Chain hoist
|
|
US1545892A
|
|
Speed control for lifting jacks
|
|
US1615268A
|
|
Lifting jack
|
|
US1514851A
|
|
Speed control for revolving doors and the like
|
|
US1380375A
|
|
Stop mechanism for lifting-jacks
|
|
US1381988A
|
|
Antifriction mechanism for lifting-jacks
|
|
US1383202A
|
|
Device for retarding the speed of lowering of self-run-down lifting-jacks
|
|
US1383201A
|
|
Brake mechanism for lifting-jacks and the like
|
|
US1383200A
|
|
Braking means for load-lifting devices
|
|
US1383199A
|
|
Speed-controlling mechanism for load-lifting devices
|
|
US1287966A
|
|
Lifting-jack.
|
|
US983359A
|
|
Ratchet device for lifting-jacks.
|
|
US929585A
|
|
Lifting-jack.
|
|
US933705A
|
|
Lifting-jack.
|
|
US933704A
|
|
Lifting-jack.
|
|
US934806A
|
|
Operating mechanism for lifting-jacks.
|
|
US921235A
|
|
Lifting-jack.
|
|
US921234A
|
|
Lifting-jack.
|
|
US898215A
|
|
Screw-jack.
|
|
CA212809A
|
|
Anti-friction mechanism for lifting jacks
|
