Patent information:
| Patent: | Utility 1,223,792 |
| Patented: | April 24, 1917 |
| Applied: | May 14, 1914 |
| Title: | Apparatus for Use in Manufacturing Articles of Ceramic Material |
| Description: | Machine for manufacturing spark plugs |
| Category: | Manufacturing |
| Assigned to: |
Patentee Information:
| JEFFERY, Joseph A. | Detroit, MI |
| JEFFERY, Benjamin A. | Detroit, MI |
Class and subclass information:
| Class: | 451 | ABRADING |
| Subclass: | 246 | |
| Class: | 451 | ABRADING |
| Subclass: | 541 |
Known specimens:
| None known |
Drawings:
Page 1 |
Page 2 |