Invention Grant
- Patent Title: Signaling system
-
Application No.: US6886736Application Date: 1936-03-14
-
Publication No.: US2149343APublication Date: 1939-03-07
- Inventor: HUBBARD FRANCIS A
- Applicant: BELL TELEPHONE LABOR INC
- Assignee: Nokia Bell Labs
- Current Assignee: Nokia Bell Labs
- Priority: US6886736 1936-03-14
- Main IPC: H04M3/64
- IPC: H04M3/64
Information query
