| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 6 | |
| #2 | Canada | 1 | |
| #3 | Germany | 1 | |
| #4 | United Kingdom | 1 | |
| #5 | Netherlands | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Transport | |
| #3 | Optics | |
| #4 | Machine tools | |
| #5 | Furniture and games |
| # | Name | Total Patents |
|---|---|---|
| #1 | Walter Pfister | 5 |
| #2 | Pfister Walter | 2 |
| #3 | Liang Cho Chi | 2 |
| #4 | Cho Antonio | 1 |
| #5 | Cho Chi Liang | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3319342A | Internal micrometer | |
| CA763657A | Internal micrometer |