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Patent
Suchergebnisse für: Quentell
- Patent:CA236781 01.01.1924 Quentell, William Prehn (P) Quentell (P) Corp. : Calculating machine
- Patent:CA239449 15.04.1924 Quentell, William Prehn (P) Quentell (P) Corp. : Calculating machine
- Patent:DE392573 24.03.1924 Quentell, William Prehn (P) Quentell (P) Corp : Rechenmaschine
- Patent:GB217107 12.06.1924 Quentell, William Prehn (P) Quentell (P) Corp. : Improvements in or relating to Calculating Machines