Invention Grant
- Patent Title: Keyboard access control system
- Patent Title (中): 键盘访问控制系统
-
Application No.: US70463257Application Date: 1957-12-23
-
Publication No.: US2994736APublication Date: 1961-08-01
- Inventor: EMIL HOPNER , WOOD FREDERICK B , JOHNSON WALTER J
- Applicant: IBM
- Assignee: Ibm
- Current Assignee: Ibm
- Priority: US70463257 1957-12-23
- Main IPC: H01H13/62
- IPC: H01H13/62 ; H04J3/00
Information query
