| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Denmark | 3 | |
| #2 | Spain | 3 | |
| #3 | Canada | 2 | |
| #4 | Switzerland | 2 | |
| #5 | Austria | 1 |
| # | Industry | |
|---|---|---|
| #1 | Audio-visual technology |
| # | Technology | |
|---|---|---|
| #1 | Special information storage |
| # | Name | Total Patents |
|---|---|---|
| #1 | Crudo Fernando | 6 |
| #2 | Fernando Crudo | 2 |
| Publication | Filing date | Title |
|---|---|---|
| ES137899A1 | Procedure for the recording or photoelectric sound reproduction of flexible phonograms in devices equipped with rotary cylindrical portagrams. | |
| ES126325A1 | New phonographic reproduction by optical reflection. | |
| CA354870A | Phonogram | |
| CA350182A | Sound reproducing method |