| Logo | Brand |
Number of cassettes
in catalog |
Year |
|---|---|---|---|
| OK MUSICA | 1 | ||
| Okura | 1 | 1986 - 1986 | |
| Olmark | 3 | 1986 - 1986 | |
| Olympia | 3 | 1977 - 1977 | |
| Olympiade 76 | 4 | 1976 - 1976 | |
| Olympic | 2 | 1976 - 1976 | |
| Olympic Records | 1 | ||
| Olympus | 1 | ||
| Omega | 4 | ||
| Omega Sound | 2 | ||
| Omicron | 1 | ||
| Onix | 2 | 1978 - 1978 | |
|
ONPA | 33 | 1980 - 1990 |
| ONSTAR | 1 | ||
| Optima | 5 | ||
| Optimax | 2 | 1978 - 1978 | |
| Optiphone | 1 | ||
| Opus | 24 | 1972 - 1994 | |
| Ora | 6 | 1992 - 1992 | |
| Orange Line | 1 |
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