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Qingian Zeng
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Manchester, CT, US
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last 30 patents
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Patent Grant
Elevator car assembly having an adjustable platform
Patent number
7,810,611
Issue date
Oct 12, 2010
Otis Elevator Company
Qingian Zeng
B66 - HOISTING LIFTING HAULING
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last 30 patents
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Patent Application
Elevator car assembly having an adjustable platform
Publication number
20070089936
Publication date
Apr 26, 2007
Qingian Zeng
B66 - HOISTING LIFTING HAULING