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发明名称
Respirator
摘要
申请公布号
US2240838(A)
申请公布日期
1941.05.06
申请号
US19410373213
申请日期
1941.01.06
申请人
EMERSON JOHN H
发明人
EMERSON JOHN H.
分类号
A61H31/02
主分类号
A61H31/02
代理机构
代理人
主权项
地址
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