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发明名称
TELEPHONE POLLING APPARATUS
摘要
申请公布号
US4160125(A)
申请公布日期
1979.07.03
申请号
US19770799141
申请日期
1977.05.23
申请人
DIGITAL PRODUCTS CORPORATION
发明人
BOWER, DAVID S.;SMITH, FRED J.
分类号
H04M3/46;(IPC1-7):H04M3/46;H04M3/50
主分类号
H04M3/46
代理机构
代理人
主权项
地址
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