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发明名称
Filter unit for respirators
摘要
申请公布号
US2235624(A)
申请公布日期
1941.03.18
申请号
US19380222139
申请日期
1938.07.30
申请人
HYGEIA FILTERING CORPORATION
发明人
SCHWARTZ NATHAN
分类号
A62B23/02
主分类号
A62B23/02
代理机构
代理人
主权项
地址
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