| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 56 | |
| #2 | Canada | 18 | |
| #3 | United Kingdom | 17 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Machines | |
| #3 | Measurement | |
| #4 | Mechanical elements |
| # | Name | Total Patents |
|---|---|---|
| #1 | Zimmerman Herman W | 56 |
| #2 | Wacker Frederick G | 6 |
| #3 | Mitchell Wallace F | 5 |
| #4 | Heon Horace C | 4 |
| #5 | Evans Douglas N | 1 |
| #6 | Fulmer Charles A | 1 |
| #7 | Gallivan John E | 1 |
| #8 | Mitchell Wallace Frederick | 1 |
| #9 | Wishart William W | 1 |
| #10 | Larson Kenneth R | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB621055A | Improvements in hones and stone carriers therefor | |
| GB619685A | Improvements in cylinder grinding tools | |
| GB631455A | Bench type honing machine | |
| US2413574A | Boring machine | |
| GB585892A | Torque measuring wrenches | |
| US2391183A | Centering means for boring machines | |
| US2400430A | Cylinder grinding tool | |
| US2401838A | Boring machine | |
| US2380605A | Cylinder ridge reamer | |
| US2345930A | Cylinder grinding tool | |
| US2331523A | Cylinder grinding tool | |
| US2320023A | Torque measuring wrench | |
| GB519815A | Torque measuring wrench | |
| GB513819A | Torque measuring wrench | |
| US2279792A | Torque wrench | |
| GB519738A | Improvements in metal-shaping machines | |
| GB519140A | Torque measuring wrench | |
| US2269503A | Torque measuring wrench | |
| US2250941A | Torque measuring wrench | |
| US2231240A | Torque measuring wrench |