| Merk | Merknaam voluit | Firma | Plaats | Datum inschrijving | Datum vroegere inschrijving |
| Quadrant | The Quadrant Cycle Company, Manufacturers of the Patent Quadrant Cycles | Quadrant Cycle Company, The / A. Alt | Leiden | 1907-12-06 | |
| Quadrant | The Quadrant Cycle Company, Manufacturers of the Quadrant Cycles | Quadrant Cycle Company, The / A. Alt | Leiden | 1927-07-21 | 1907-12-06 |
| Quadrant | The Quadrant Cycle Company, manufacturers of the Quadrant Cycles | Alt, A. / René Alt | Leiden, Mare 112 | 1947-08-11 | 1907-12-06 |
| Quality Value Service | Quality Value Service | Amstrong Cycles Ltd. | Birmingham, 11, England, Sampson Road North | 1947-01-25 | 1924-10-29 |
