| Polaroid Corporation |
| Precisa Rechenmaschinenfabrik AG |
| Preh GmbH |
| Primax Electronics LTD. |
| Privileg / Olympia International |
| Produx Otto Meuter |
| Prof. G. Herold |
| Professor Hofmann |
| Promed GmbH |
| Psion Plc. |
| QMS |
| Quantum Corporation |
| Quantum Corporation |
| Qume |
| RCA |
| ROBERT BOSCH GmbHStuttgart |
| RRZE |
| RRZE |
| RRZE |
| RRZE |
| RRZE |
| RRZE |
| RRZE |
| RRZE Uni Erlangen |
| Racal Electronics plc |
| Radiotone |
| Random Computers |
| Raytheon Data Systems |
| Reichert-Elektronik |
| Reiss |
| Reliable Typewriter & Adding Machines Co |
| Remington Rand UNIVAC |
| Remington Rand UNIVAC |
| Remington Rand UNIVAC, Frankfurt am Main - Rödelheim |
| Resulta Maschinen- und Werkzeugfabrik Paul Brüning |
| Rever Computer Inc. |
| Rheinmetall-Borsig AG |
| Rheinmetall-Borsig AG |
| Rheinmetall-Borsig AG |
| Rheinmetall-Borsig AG/Dtl. |
| Rhode-Schwarz |
| Robert Kling GmbH |
| Rockwell International |
| Rockwell International |
| Rolodex Electronics |
| SABA GmbH |
| SEKURIA |
| SIEMENS AG |
| SIEMENS AG |
| SIEMENS AG |