Improvements in or relating to respirators,申请号GB19370032223-传众专利搜索

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发明名称	Improvements in or relating to respirators
摘要
申请公布号	GB506168(A)	申请公布日期	1939.05.23
申请号	GB19370032223	申请日期	1937.11.23
申请人	B. F. MCDONALD COMPANY	发明人
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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