| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 3 | |
| #2 | United Kingdom | 3 | |
| #3 | Switzerland | 2 | |
| #4 | Spain | 2 | |
| #5 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Cameras | |
| #2 | Electric switches | |
| #3 | Special electric heating or lighting |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wolff Harry Ashton | 7 |
| #2 | Harry Ashton Wolff | 2 |
| Publication | Filing date | Title |
|---|---|---|
| CA141281A | Photographic apparatus | |
| CA142783A | Distributor for electricity | |
| GB191127599A | Improvements in and relating to Photographic Enlarging and like Apparatus. | |
| US989465A | Automatic distributer for electricity. | |
| GB191029810A | Automatic Distributor for Electricity. | |
| CA122852A | Photographic apparatus | |
| GB190918699A | Automatic Photographic Apparatus. |