Improvements in pumping apparatus for evacuated envelopes,申请号GB19550029352-传众专利搜索

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发明名称	Improvements in pumping apparatus for evacuated envelopes
摘要
申请公布号	GB776336(A)	申请公布日期	1957.06.05
申请号	GB19550029352	申请日期	1955.10.14
申请人	MACHLETT LABORATORIES, INCORPORATED	发明人
分类号	F04F9/00;H01J9/385	主分类号	F04F9/00
代理机构		代理人
主权项
地址

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