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发明名称
Audio-visual signalling system for use in connection with stationary derricks, mobile cranes and the like during demolition and construction of buildings
摘要
申请公布号
US3257655(A)
申请公布日期
1966.06.21
申请号
US19620209081
申请日期
1962.07.11
申请人
DE PALMA FRANK
发明人
PALMA FRANK DE
分类号
G08B7/00
主分类号
G08B7/00
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代理人
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地址
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