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经营范围
发明名称
Filter type respirator
摘要
申请公布号
US2139137(A)
申请公布日期
1938.12.06
申请号
US19370153885
申请日期
1937.07.16
申请人
NATHAN SCHWARTZ
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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