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发明名称
Signaling system
摘要
申请公布号
US1784645(A)
申请公布日期
1930.12.09
申请号
US19280287552
申请日期
1928.06.22
申请人
GENERAL ELECTRIC COMPANY
发明人
TOLSON WILLIAM A.
分类号
H04M3/40
主分类号
H04M3/40
代理机构
代理人
主权项
地址
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