| Logo | Brand |
Number of cassettes
in catalog |
Year |
|---|---|---|---|
| O.X | 1 | ||
| OKA | 1 | 1985 - 1985 | |
| OKI | 1 | ||
|
ONPA | 32 | 1980 - 1990 |
| ONSTAR | 1 | ||
|
ORWO | 23 | 1972 - 1989 |
| OTC | 1 | 1980 - 1980 | |
| OTTO | 3 | ||
| Oceanic | 2 | ||
| Octave | 1 | ||
| Odakyu | 4 | 1975 - 1975 | |
| Odeon | 1 | ||
| Ogaton | 2 | ||
| Okura | 1 | 1986 - 1986 | |
| Olmark | 3 | 1986 - 1986 | |
| Olympia | 3 | 1977 - 1977 | |
| Olympiade 76 | 4 | 1976 - 1976 | |
| Olympic | 2 | 1976 - 1976 | |
| Omega | 4 | ||
| Omega Sound | 2 |
