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Patents Index: literature (735 Artikel)
| Abakus in Youtube | to | Cajori 1909 |
| Calculators in Youtube | to | Glaser 1971 |
| GNC-Monatsschrift | to | Journal of the Oughtred Society |
| Kadner 1956 | to | Morin 1913 |
| Mueller 1788 | to | Reese 2013/4 |
| Reese 2013/5 | to | Trautschold 1910 |
| Treves 1911 | to | Weiss 2019.3 |
| Weiss 2019.4 | to | Zühlke 1952 |