Invention Grant
- Patent Title: Class of line indication in telephone systems
- Patent Title (中): 电话系统中的线路指示类
-
Application No.: US74985047Application Date: 1947-05-22
-
Publication No.: US2593419APublication Date: 1952-04-22
- Inventor: DEN HERTOG MARTINUS , CHARLES BERDEN AMEDIE
- Applicant: INT STANDARD ELECTRIC CORP
- Assignee: Int Standard Electric Corp
- Current Assignee: Int Standard Electric Corp
- Priority: GB232790X 1939-05-24
- Main IPC: H04Q3/62
- IPC: H04Q3/62
Information query
