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发明名称
ACOUSTIC COUPLER DEVICE
摘要
申请公布号
JPH04117054(A)
申请公布日期
1992.04.17
申请号
JP19900263208
申请日期
1990.10.02
申请人
RICOH CO LTD
发明人
SHIMIZU MASAYUKI
分类号
H04N1/00;H04M1/21;H04M1/32;H04M11/00
主分类号
H04N1/00
代理机构
代理人
主权项
地址
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