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发明名称
Self-leveling device for electric elevators
摘要
申请公布号
US2112985(A)
申请公布日期
1938.04.05
申请号
US19370126992
申请日期
1937.02.23
申请人
EMIL DRENKER
发明人
DRENKER EMIL
分类号
B66B1/50
主分类号
B66B1/50
代理机构
代理人
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