Patent US 4227121A
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| Patent number | US 4227121A (click link for details and documents via Google Patents) |
|---|---|
| Title | Waveform observing method and apparatus |
| Inventors | Yasumori Ishijima, Rikichi Murooka |
| Company | Tektronix Inc |
| Filing date | 1978-07-07 |
| Grant date | 1980-10-07 |