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Patents Index: calculating aids (329 Artikel)
| ABA-Ten Rule | to | Calculigraphe |
| Cashmores Proportion Calculator | to | Multator (Addiator) |
| Multiplex | to | Taschen-Rechner (Zahlenschieber) |
| Taschen Vieh-Waage | to | Zahlenschieber 50-1917 Russland |