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1.发明授权Device for reduction of cross talk between different lines at switches for distribution of programs 失效用于减少交换机上不同线路之间串扰的设备，用于分发程序
公开(公告)号：US2467494A
公开(公告)日：1949-04-19
申请号：US73748847
申请日：1947-03-27
Applicant: ERICSSON TELEFON AB L M
Inventor： VILHELM PETERSON NILS
IPC: H04H20/83
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公开(公告)号：US2499279A
公开(公告)日：1950-02-28
申请号：US2090848
申请日：1948-04-14
Applicant: ERICSSON TELEFON AB L M
Inventor： VILHELM PETERSON NILS
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