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发明名称
Potential changer
摘要
申请公布号
US2032424(A)
申请公布日期
1936.03.03
申请号
US19320635056
申请日期
1932.09.27
申请人
P. R. MALLORY & CO., INCORPORATED
发明人
LEAR WILLIAM P.;NULSEN MARVIN E.;YODER RAYMOND S.
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主分类号
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