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US1696328A
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Safety mechanism for elevator-shaft doors
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Elevator-door mechanism
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Safety mechanism for elevator-shaft doors
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Door-operating mechanism.
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US1353851A
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Safety mechanism for elevator-shaft doors
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Sliding-door-locking mechanism.
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Door check and closer.
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Elevator-shaft sliding-door mechanism.
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Door check and closer.
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Door check and closer.
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|
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Door check and closer
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CA218724A
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Mechanism for elevator shaft doors
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