| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 18 | |
| #2 | United Kingdom | 5 | |
| #3 | Switzerland | 4 | |
| #4 | France | 2 |
| # | Industry | |
|---|---|---|
| #1 | Optics | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Cameras | |
| #2 | Optical systems | |
| #3 | Milling | |
| #4 | Safety devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Oswald Buechner | 4 |
| #2 | Buechner Oswald | 2 |
| #3 | Buol Hans | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB182110A | Improvements in or relating to screens for exhibiting optically projected pictures | |
| GB177758A | Improvements in lenses for kinematographic and other purposes | |
| GB169960A | Improvements in lenses for kinematographic and other purposes | |
| GB167472A | Improvements in lenses for kinematographic and other purposes | |
| GB139815A | Improvements in transparent projection screens |