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公开(公告)号：US757007A
公开(公告)日：1904-04-12
申请号：US1902117117
申请日：1902-07-26
Applicant: GEN ELECTRIC
Inventor： WOOD HOWARD I , ROBINSON RALPH C
CPC classification number: H01J19/28
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公开(公告)号：US806608A
公开(公告)日：1905-12-05
申请号：US1903152324
申请日：1903-04-13
Applicant: GEN ELECTRIC
Inventor： WHITNEY WILLIS R , ROBINSON RALPH C
CPC classification number: C04B35/652
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