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发明名称
Dictation type mask with valve controlled inhalation and exhalation
摘要
申请公布号
US2830135(A)
申请公布日期
1958.04.08
申请号
US19530400325
申请日期
1953.12.21
申请人
WEBB HORACE L
发明人
WEBB HORACE L.
分类号
H04R1/08
主分类号
H04R1/08
代理机构
代理人
主权项
地址
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