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公开(公告)号：US1955972A
公开(公告)日：1934-04-24
申请号：US65110133
申请日：1933-01-11
Applicant: WILLIAM FLOYD LEE
Inventor： EDWARD MUSE MELVIN
IPC: H04M1/22
CPC classification number: H04M1/22
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公开(公告)号：US1955971A
公开(公告)日：1934-04-24
申请号：US60175632
申请日：1932-03-29
Applicant: WILLIAM FLOYD LEE
Inventor： EDWARD MUSE MELVIN
IPC: H01J17/49
CPC classification number: H01J17/491
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