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摘要
申请公布号
US1804425(A)
申请公布日期
1931.05.12
申请号
US19280298429
申请日期
1928.08.09
申请人
LEFKOWITZ CHARLES M
发明人
LEFKOWITZ CHARLES M.
分类号
H01H17/00
主分类号
H01H17/00
代理机构
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