Patent information:
| Patent: | Utility 1,186,203 |
| Patented: | June 6, 1916 |
| Applied: | January 31, 1914 |
| Title: | Apparatus for Use in Manufacturing Articles of Ceramic Material |
| Description: | Method of 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: | 247 | |
| Class: | 451 | ABRADING |
| Subclass: | 239 |
Known specimens:
| None known |
Drawings:
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