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发明名称
Conical pendulum, alternating current clock
摘要
申请公布号
US2722097(A)
申请公布日期
1955.11.01
申请号
US19520277268
申请日期
1952.03.18
申请人
CONSERVATOIRE NATIONAL DES ARTS ET METIERS
发明人
LEFRAND EDOUARD
分类号
G04C3/033
主分类号
G04C3/033
代理机构
代理人
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地址
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