| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 12 | |
| #2 | United States | 3 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Control | |
| #3 | Textiles and paper |
| # | Technology | |
|---|---|---|
| #1 | Filing and indexing | |
| #2 | Copy machines | |
| #3 | Teaching materials |
| # | Name | Total Patents |
|---|---|---|
| #1 | Volk Alfred | 9 |
| #2 | Alfred Volk | 3 |
| Publication | Filing date | Title |
|---|---|---|
| US2297442A | Filing system | |
| US2272685A | Separator means for use in vertical filing systems | |
| GB521926A | Improvements in separators for use in separating documents, cards or the like filed in vertical filing cabinets or the like | |
| US2226791A | Separator means for filing systems |