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发明名称
Audible and visual two-way communication and annunciation system for hospitals and the like
摘要
申请公布号
US2740842(A)
申请公布日期
1956.04.03
申请号
US19520271128
申请日期
1952.02.12
申请人
COMMERCIAL RADIO-SOUND CORP.
发明人
SCHNEIDER ARTHUR W.;COOPERMAN BERNARD
分类号
G08B5/22;H04M11/02
主分类号
G08B5/22
代理机构
代理人
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