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发明名称
ELECTROACOUSTIC TRANSMISSION TESTING DEVICE
摘要
申请公布号
US3598929(A)
申请公布日期
1971.08.10
申请号
USD3598929
申请日期
1967.12.14
申请人
HICKOK ELECTRICAL INSTRUMENT CO.:THE
发明人
STANLEY M. SEIDMAN
分类号
H04M3/30;(IPC1-7):H04R29/00
主分类号
H04M3/30
代理机构
代理人
主权项
地址
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