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发明名称
VARIABLE RELUCTANCE PHONOGRAPH CARTRIDGE
摘要
申请公布号
US3469040(A)
申请公布日期
1969.09.23
申请号
USD3469040
申请日期
1965.04.15
申请人
EMPIRE SCIENTIFIC CORP.
发明人
HARRY B. SHAPER
分类号
H04R11/12;(IPC1-7):H04R19/06
主分类号
H04R11/12
代理机构
代理人
主权项
地址
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