Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B66
HOISTING; LIFTING; HAULING
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B66B
ELEVATORS; ESCALATORS OR MOVING WALKWAYS
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5/00
Applications of checking, fault-correcting, or safety devices in elevators
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B66B5/02
responsive to abnormal operating conditions
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B66B5/021
the abnormal operating conditions being independent of the system
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B66B5/022
where the abnormal operating condition is caused by a natural event, e.g. earthquake
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