| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 12 | |
| #2 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Electric discharge tubes | |
| #2 | AC and DC conversion devices | |
| #3 | Special electric heating or lighting | |
| #4 | Electric switches | |
| #5 | Steam generation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Thomas Percy Holbrook | 12 |
| #2 | Percy Holbrook Thomas | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB190608613A | Improvements relating to Electric Vapour Apparatus. | |
| GB190507892A | Improvements in Vapour Electric Apparatus. |