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公开(公告)号：US3197669A
公开(公告)日：1965-07-27
申请号：US11208461
申请日：1961-05-23
Applicant: WELDING RESEARCH INC
Inventor： LEE SOLOMON JULIUS
IPC: H01J37/02 , H01J37/065 , H01J37/067 , H01J37/07
CPC classification number: H01J37/067 , H01J37/02 , H01J37/065 , H01J37/07
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