Telephone auxiliary amplifying device

申请公布号：US2501955(A)

申请号：US19460651169

申请日期：1946.03.01

申请公布日期：1950.03.28

申请人：

MCWANE ARTHUR T

发明人：MCWANE ARTHUR T.

分类号：H04M1/215

主分类号：H04M1/215

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