| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 5 | |
| #2 | Germany | 3 | |
| #3 | United States | 3 | |
| #4 | Canada | 1 | |
| #5 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Mechanical elements | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Grinding or polishing devices | |
| #2 | Gearing | |
| #3 | Unspecified technologies | |
| #4 | Making gears or toothed racks |
| # | Name | Total Patents |
|---|---|---|
| #1 | Darby Walter | 5 |
| #2 | Walter Darby | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US2720791A | Drive means for a reciprocatory member | |
| US2715896A | Means for feeding a tool | |
| GB733827A | Drive arrangement for gearing interconnecting a pair of non-parallel shafts | |
| GB735594A | Grinding machine for dressing gear teeth by a helically ribbed wheel | |
| GB727534A | Improvements in machines including crushing rollers | |
| GB730824A | Reciprocatory drive for a rack | |
| GB728101A | Means for feeding a tool | |
| CA538219A | Drive means for a reciprocatory member |