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摘要
申请公布号
US2092678(A)
申请公布日期
1937.09.07
申请号
US19360069932
申请日期
1936.03.20
申请人
MERRYMAN JOHN C
发明人
MERRYMAN JOHN C.
分类号
G04C21/22
主分类号
G04C21/22
代理机构
代理人
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地址
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