Patent
Suchergebnisse für: Wrenn Adding Machine Co.
- Patent:CA195907 06.01.1920 Wrenn, Herbert (P) A. Wrenn Adding Machine Co. (P) : Calculator
- Patent:US1438419 12.12.1922 Wrenn, Herbert (P) A. Wrenn Adding Machine Co. (P) : Calculating machine
- Patent:US1481172 15.01.1924 Wrenn, Herbert (P) A. Wrenn Adding Machine Co. (P) : Calculating Machine