Invention Grant
- Patent Title: Gaseous tube selecting switch for use in automatic telephony
- Patent Title (中): 用于自动电话的气体管选择开关
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Application No.: US79335247Application Date: 1947-12-23
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Publication No.: US2598392APublication Date: 1952-05-27
- Inventor: KNUT KAELL , WALDEMAR HULLEGARD ERIK
- Applicant: ERICSSON TELEFON AB L M
- Assignee: Ericsson Telefon Ab L M
- Current Assignee: Ericsson Telefon Ab L M
- Priority: SE269355X 1947-01-03
- Main IPC: H01J17/14
- IPC: H01J17/14 ; H01J31/06 ; H03K29/00 ; H04Q3/52
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