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公开(公告)号：US2931986A
公开(公告)日：1960-04-05
申请号：US56866756
申请日：1956-02-29
Applicant: PHILIPS CORP
Inventor： JOHANNES ENSINK , ANNE KLAASSEN
CPC classification number: H03F3/3066 , H03F3/26
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2.发明授权Device for transmission of audio-frequency signals and ringing signals of materially higher power 失效用于传输音频信号和重大功率的振铃信号的装置
公开(公告)号：US2854514A
公开(公告)日：1958-09-30
申请号：US57655756
申请日：1956-04-06
Applicant: PHILIPS CORP
Inventor： JOHANNES ENSINK , ANNE KLAASSEN
IPC: C08F255/00 , H01B3/44 , H04B3/36 , H04B3/42 , H04M3/40
CPC classification number: H04M3/40 , C08F255/00 , H01B3/441 , H01B3/442 , H04B3/36 , H04B3/42 , C08F212/08
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