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公开(公告)号：US3411226A
公开(公告)日：1968-11-19
申请号：US60811467
申请日：1967-01-09
Applicant: BELL TELEPHONE LABOR INC
Inventor： ERICSSON JAMES W
IPC: G09F1/12
CPC classification number: G09F1/12
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公开(公告)号：US3338002A
公开(公告)日：1967-08-29
申请号：US42186664
申请日：1964-12-29
Applicant: BELL TELEPHONE LABOR INC
Inventor： ERICSSON JAMES W , PRESCOTT ROBERT E
IPC: E04H1/14
CPC classification number: E04H1/14
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