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公开(公告)号：US2935566A
公开(公告)日：1960-05-03
申请号：US74680258
申请日：1958-07-07
Applicant: ROBERT KARL
Inventor： ROBERT KARL
IPC: H04M1/654
CPC classification number: H04M1/6545
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公开(公告)号：US3339976A
公开(公告)日：1967-09-05
申请号：US54966466
申请日：1966-05-12
Applicant: ROBERT KARL
Inventor： ROBERT KARL
IPC: B60N2/20
CPC classification number: B60N2/20
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