Invention Grant
- Patent Title: Electric testing apparatus.
- Patent Title (中): 电测试装置
-
Application No.: US1912677822Application Date: 1912-02-15
-
Publication No.: US1046148APublication Date: 1912-12-03
- Inventor: BUTLER CHARLES R
- Applicant: BUTLER CHARLES R
- Assignee: Charles R Butler
- Current Assignee: Charles R Butler
- Priority: US1912677822 1912-02-15
Information query
