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公开(公告)号：US820348A
公开(公告)日：1906-05-08
申请号：US1905249340
申请日：1905-03-10
Applicant: GEN ELECTRIC
Inventor： BURROWS WILLIAM R
CPC classification number: H01J13/14 , Y10S428/929 , Y10T428/12646 , Y10T428/12875 , Y10T428/12903
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