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发明名称
Charge rate calculator for automatic telephony
摘要
申请公布号
US2588684(A)
申请公布日期
1952.03.11
申请号
US19470743963
申请日期
1947.04.25
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
STEHLIK RUDOLPH FRANK
分类号
H04M15/04;H04M15/10
主分类号
H04M15/04
代理机构
代理人
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地址
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