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发明名称
Step-by-step system
摘要
申请公布号
US2823264(A)
申请公布日期
1958.02.11
申请号
US19530345823
申请日期
1953.03.31
申请人
GENERAL DYNAMICS CORPORATION
发明人
PHARIS WILLIAM W.
分类号
H04M3/56;H04M11/02
主分类号
H04M3/56
代理机构
代理人
主权项
地址
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