Invention Grant
- Patent Title: Telephone call transmitter
- Patent Title (中): 电话呼叫发射机
-
Application No.: US30254239Application Date: 1939-11-02
-
Publication No.: US2280604APublication Date: 1942-04-21
- Inventor: RICHARD CHARLES D
- Applicant: BELL TELEPHONE LABOR INC
- Assignee: Nokia Bell Labs
- Current Assignee: Nokia Bell Labs
- Priority: US30254239 1939-11-02
- Main IPC: H04M1/274
- IPC: H04M1/274
Information query
