Patent US 4551734A
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| Patent number | US 4551734A (click link for details and documents via Google Patents) |
|---|---|
| Title | Ink cartridge with ink level sensor |
| Inventors | Gary C. Causley, Martin D. Rosback |
| Company | Tektronix Inc |
| Filing date | 1984-12-06 |
| Grant date | 1985-11-05 |