| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 7 | |
| #2 | United Kingdom | 2 | |
| #3 | Spain | 1 | |
| #4 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Shafts | |
| #2 | Unspecified technologies | |
| #3 | Rotary-pistons | |
| #4 | Venting or aerating devices | |
| #5 | Pipes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Frye Colin Michael | 1 |
| #2 | Sutton Dudley G | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB745679A | Improvements in mine roof supports | |
| GB700790A | Improvements relating to valves |