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发明名称
Bone conduction audiphone
摘要
申请公布号
US2402480(A)
申请公布日期
1946.06.18
申请号
US19410418171
申请日期
1941.11.07
申请人
DICTOGRAPH PRODUCTS COMPANY, INC.
发明人
ZARTH WILLIAM A.
分类号
H04R1/14;H04R11/00
主分类号
H04R1/14
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代理人
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