Patent search ap:("RADIO RES LAB INC") AND inv:"BARNETT DAVID A" Page 1

1.

发明授权
Electrode for electron-discharge devices 失效
Title translation: 电子放电装置用电极

公开(公告)号：US1974945A

公开(公告)日：1934-09-25

申请号：US50713331

申请日：1931-01-07

Applicant: RADIO RES LAB INC

Inventor： BARNETT DAVID A

IPC: H01J1/13

CPC classification number: H01J1/13

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