Typy: KS 6.20/20 Duo, 6.20-6.80/20 Duo, 6.21/20 Duo, 6.50-7.60/24 Duo Vario, 6.80-13.00 Duo Uni III, 13.00 Duo II
Producent: Wilhelm Fricke SE, Zum Kreuzkamp 7, 27404 Heeslingen, Deutschland, www.granit-parts.com