| Logo | Brand |
Number of cassettes
in catalog |
Year |
|---|---|---|---|
| Olympia | 3 | 1977 - 1977 | |
| Olympiade 76 | 4 | 1976 - 1976 | |
| Olympic | 2 | 1976 - 1976 | |
| Olympic Records | 1 | ||
| Omega | 8 | ||
| Omega Sound | 2 | ||
| Omicron | 1 | ||
| Onix | 1 | 1978 - 1978 | |
|
ONPA | 33 | 1980 - 1990 |
| ONSTAR | 1 | ||
| Optima | 5 | ||
| Optimax | 4 | 1978 - 1980 | |
| Optiphone | 1 | ||
| Opus | 22 | 1972 - 1994 | |
| Ora | 6 | 1992 - 1992 | |
| Orange Line | 1 | ||
| Orchid | 6 | 1984 - 1984 | |
| ORF | 2 | ||
| Orion | 2 | ||
| Orson | 3 |
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