| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 5 | |
| #2 | France | 3 | |
| #3 | Germany | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Special information storage |
| # | Name | Total Patents |
|---|---|---|
| #1 | Perfectone S A Produits | 3 |
| #2 | A Produits Perfectone S | 2 |
| #3 | Bessire Henri-Maurice | 2 |
| #4 | Henri Bessire | 1 |
| #5 | Jean-Jacques Bessire | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE933894C | Device for reversing the direction of travel of magnetic recorders | |
| DE938936C | Device for automatic and manual application of the pressure roller and the respective sound heads of magnetic sound devices | |
| US2681224A | Device for changing the speed of recording tape | |
| US2697756A | Magnetic recording apparatus | |
| GB707667A | Magnetic recording and reproducing apparatus | |
| GB716887A | Sound recording and play-back apparatus |