Patent search ap:("ERICSSON TELEFON AB L M") AND inv:"KNUT KAELL" Page 1

1.

发明授权
Gaseous tube selecting switch for use in automatic telephony 失效
Title translation: 用于自动电话的气体管选择开关

公开(公告)号：US2598392A

公开(公告)日：1952-05-27

申请号：US79335247

申请日：1947-12-23

Applicant: ERICSSON TELEFON AB L M

Inventor： KNUT KAELL , WALDEMAR HULLEGARD ERIK

IPC: H01J17/14 , H01J31/06 , H03K29/00 , H04Q3/52

CPC classification number: H01J17/14 , H01J31/06 , H03K29/00 , H04Q3/525

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