| Oerlikon Bührle |
| Ohm |
| Ohm Design - Computer Recycling |
| Okano, Karstadt AG, Essen |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olivetti & C. SpA |
| Olympia AG |
| Olympia Werke AG |
| Olympia Werke AG |
| Olympia Werke AG |
| Olympia Werke AG |
| Olympia Werke AG |
| Olympia Werke AG |
| Olympia Werke AG |
| Olympia Werke AG |
| Olympia-Werke AG |
| Olympia-Werke AG |
| Olympus K.K. |
| Opcode Systems Inc. |
| Otto Meuter & Sohn Rechenmaschinenfabrik |
| P&S |
| P. Scharl |
| PAUL MAC ALISTER & ASSOCS |
| PSION PLC |
| Palm Inc. |
| Palm Inc. |
| Palm Inc. |
| Palm Inc. |
| Panasonic Corporation |
| Panasonic Industrial Company |
| ParsyTec AG |
| Parsytec |
| Peter Müller |
| Pico |
| Pico |
| Pioneer Electronic Corp. |
| Platen-Gymnasium Ansbach |
| Plessey Peripherical Systems |
| Polaroid Corporation |