| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 5 | |
| #2 | United Kingdom | 5 | |
| #3 | United States | 3 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Electrical machinery and energy | |
| #3 | Optics |
| # | Technology | |
|---|---|---|
| #1 | Writing or drawing tools | |
| #2 | Non-portable lighting devices | |
| #3 | Processing photographic materials |
| # | Name | Total Patents |
|---|---|---|
| #1 | August Leistenschneider | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US2311906A | Lead pencil | |
| GB444992A | Improvements in propelling pencils | |
| US2049965A | Lead pencil | |
| US2049208A | Magazine for lead pencils | |
| GB426122A | Improvements in magazines for propelling pencils | |
| GB406451A | Improvements in or relating to propelling pencils | |
| GB328725A | Automatic developing device for photographic plates, films and the like |