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公开(公告)号:US2265223A
公开(公告)日:1941-12-09
申请号:US33887440
申请日:1940-06-05
Applicant: BELL TELEPHONE LABOR INC
Inventor: BROWN HORATIO G W , LOGAN MASON A
IPC: H04M3/64
CPC classification number: H04M3/64
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公开(公告)号:US1862519A
公开(公告)日:1932-06-14
申请号:US50820731
申请日:1931-01-12
Applicant: BELL TELEPHONE LABOR INC
Inventor: BROWN HORATIO G W
IPC: H04M3/487
CPC classification number: H04M3/4876
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