| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 4 | |
| #2 | Germany | 3 | |
| #3 | Ireland | 2 | |
| #4 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology | |
| #2 | Computer technology |
| # | Technology | |
|---|---|---|
| #1 | Special information storage | |
| #2 | Data recognition and presentation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Fernando Crudo | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB442112A | Improvements in sound recording or reproducing apparatus | |
| IE14020L | Sound reproduction | |
| GB441437A | Improved method and apparatus for photo-electric sound reproduction | |
| IE12750L | Sound reproduction | |
| US2018200A | Sound record for optic sound reproduction | |
| GB386842A | Improvements in sound reproducing apparatus | |
| GB402074A | Sound records for optical sound reproduction | |
| US1957158A | Phonographic invention |