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摘要
申请公布号
US2897031(A)
申请公布日期
1959.07.28
申请号
US19580739091
申请日期
1958.06.02
申请人
ERNEST FROST JAMES
发明人
FROST JAMES ERNEST
分类号
H04M1/21
主分类号
H04M1/21
代理机构
代理人
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