| All Patents in class 74/74 |
Patents 1 -
15
of 15
      |
| Number | Title | Classification(s) |
| 319,430 | brace or drill with alternating rotation | 74/74, 81/34 |
| 900,144 | Combination Tool | 74/318, 74/74 |
| 930,472 | Valve Grinder | 451/117, 74/320, 74/74 |
| 942,222 | Valve Grinder | 451/117, 74/54, 74/70, 74/74 |
| 1,015,902 | Valve Grinder | 451/117, 74/320, 74/74 |
| 1,017,242 | Combined Breast Drill and Valve Grinder | 192/20, 451/117, 74/318, 74/320, 74/347, 74/423, 74/74 |
| 1,102,581 | Valve Grinder | 451/117, 74/74 |
| 1,161,070 | Valve Grinder | 451/117, 74/320, 74/435, 74/74 |
| 1,282,018 | Valve Grinder | 451/115, 74/320, 74/402, 74/435, 74/74 |
| 1,326,190 | Operating Means For Valve Grinding Tools | 451/117, 74/320, 74/74 |
| 1,353,902 | Driving Mechanism For Grinding Tools | 451/117, 74/320, 74/74, 81/34 |
| 1,421,486 | Operating Device For Valve Grinders | 451/117, 74/74 |
| 1,441,032 | Valve Grinder | 451/117, 74/320, 74/74 |
| 1,483,721 | Valve grinder | 74/74 |
| 1,707,572 | Valve Grinder | 451/117, 74/449, 74/74 |
