| Brevetto: | GB 139203 |
| Titolo: | Improvements in Calculating Machines |
| Data: | 03.03.1921 |
| Luogo: | Newark, New Jersey |
| Nazione: | Gran Bretagna |
| Persona: | Blaustein, Joseph (P) |
| Ditta: | |
| Link interni: | |
| Keywords: | |
| Link al brevetto: (without guarantee) |  GB139203 (http://v3.espacenet.com/textdoc?DB=EPODOC&F=0&IDX=GB139203) |
Aus der Patentschrift GB139203