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Search results for: Wrenn Adding Machine Co.
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- 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