| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 3 | |
| #2 | Switzerland | 3 | |
| #3 | France | 3 | |
| #4 | United States | 3 | |
| #5 | Denmark | 2 | |
| #6 | Netherlands | 2 | |
| #7 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Optics | |
| #3 | Machine tools | |
| #4 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Perforating | |
| #2 | Unspecified technologies | |
| #3 | Cameras | |
| #4 | Unspecified technologies | |
| #5 | Photosensitive materials | |
| #6 | Electric discharge tubes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Karl Wahl | 2 |
| #2 | Sifico A-G | 2 |
| #3 | Botho Hollaender Max | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB493644A | Improvements in or relating to the perforation of an unperforated positive film in correspondence with a perforated negative film | |
| US2191017A | Process for the production of silverless picture and sound records by the chromate method | |
| US2139214A | Perforation of an unperforated posipive film in correspondence with perforated negative film | |
| US2086289A | Apparatus for copying films |