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Patents Index: calculating aids (457 Artikel)
| ABA-Ten Rule | to | Bamberger Ideal |
| Bamberger Omega | to | Heath Sektor |
| Hélice a calcul | to | NU AD Adder |
| Nystrom's Calculator | to | Sonne (Rechenscheibe) |
| Soroban mit Hilfstabellen | to | Zwölfmeter Rechenschieber |