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发明名称
Hygienic mouthpiece
摘要
申请公布号
US1962639(A)
申请公布日期
1934.06.12
申请号
US19320638557
申请日期
1932.10.19
申请人
WILLIAM DRUMMOND-DICK
发明人
DRUMMOND-DICK WILLIAM
分类号
H04R1/12
主分类号
H04R1/12
代理机构
代理人
主权项
地址
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