| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 20 | |
| #2 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Machines | |
| #3 | Measurement | |
| #4 | Electrical machinery and energy | |
| #5 | Computer technology | |
| #6 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Turning | |
| #3 | Handles for hand implements | |
| #4 | Grinding or polishing devices | |
| #5 | Measuring distances | |
| #6 | Workshop equipment | |
| #7 | Electric switches | |
| #8 | Counting mechanisms | |
| #9 | Clutches and brakes | |
| #10 | Accessories for machine tools |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hapgood Oscar D | 8 |
| #2 | Farley Fred E | 5 |
| #3 | Arnold George A | 2 |
| #4 | Miller Lloyd L | 1 |
| #5 | Francis Ducharme | 1 |
| #6 | Severance Charles D | 1 |
| #7 | Lanfair Herbert D | 1 |
| #8 | Stetson Raymond O | 1 |
| #9 | Young Frank L | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1770884A | Breast drill | |
| US1752112A | Spirit level | |
| US1733931A | Lubricating bearing | |
| US1712261A | Switch for power drills | |
| US1624339A | Level | |
| US1593908A | Bit-brace chuck | |
| US1564460A | Drill | |
| US1508512A | Ratchet mechanism | |
| US1584071A | Drill supporting and feeding apparatus | |
| US1462963A | Tool | |
| US1492680A | Hand tool | |
| US1518579A | Valve-grinding tool | |
| US1449400A | Hand tool | |
| US1172793A | Revolution-counter. | |
| US1157218A | Breast-drill. | |
| US1102581A | Valve-grinder. | |
| US1166364A | Tool. | |
| US973489A | Drill. | |
| US977176A | Ratchet-drill. | |
| US648589A | Holder for drills. |