Patent:US4629429
| Patent: | US 4629429 |
| Titel: | Abacus with each counter held in position by friction or magnetic attraction |
| Datum: | 16.12.1986 |
| Ort: | |
| Land: | USA |
| Person: | Horie, Tsuyoshi (7-15, Iwamoto-cho 3-chome,, Chiyoda-ku, |
| Firma: | |
| Links im Rechnerlexikon: | Kugelrechner |
| Schlagworte: | |
| Link zum Patentamt: (ohne Garantie) | US4629429 (espacenet), US4629429 (uspto) |
- DATUM: 16.12.1986
- TITEL: Abacus with each counter held in position by friction or magnetic attraction
- PERSON: HORIE TSUYOSHI
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US4629429