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发明名称
TONE SIGNAL COMMUNICATIONS APPARATUS
摘要
申请公布号
US3569937(A)
申请公布日期
1971.03.09
申请号
USD3569937
申请日期
1968.11.06
申请人
MERRILL HEATTER
发明人
MERRILL HEATTER
分类号
G08C19/12;H04H20/31;(IPC1-7):H04B7/00;H04Q9/00
主分类号
G08C19/12
代理机构
代理人
主权项
地址
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