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Glossary 
Patents Index: literature (741 Artikel)
| Abakus in Youtube | to | BZB |
| Cajori 1909 | to | Girbardt/Schmidt 5-2003 |
| Glade/Manteuffel 1973 | to | Jacobs/Tumma 2006 |
| Jacob 1911 | to | MK-BT |
| Moderne Büromaschinen 1931 | to | Reese 2008 |
| Reese 2008/1 | to | The Office (1886) |
| The Office (1936) | to | Weiss 2017.3 |
| Weiss 2017.4 | to | Zühlke 1952 |