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发明名称
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摘要
申请公布号
US2929055(A)
申请公布日期
1960.03.15
申请号
US19530369477
申请日期
1953.07.21
申请人
MARCHANT RESEARCH, INC.
发明人
WAHLSTROM GUNNAR
分类号
H03M1/00
主分类号
H03M1/00
代理机构
代理人
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