Patent:US3000561
Brevetto: | US 3000561 |
Titolo: | Ten key adding and subtracting machine |
Data: | 19.09.1961 |
Luogo: | |
Nazione: | Stati Uniti |
Persona: | Pitman Richard W |
Ditta: | Underwood (P) |
Link interni: | |
Keywords: | |
Link al brevetto: (without guarantee) | ![]() ![]() |
- DATUM: 19.09.1961
- TITEL: Ten key adding and subtracting machine
- PERSON: UNDERWOOD CORP