Patent US 3350640A
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| Patent number | US 3350640A (click link for details and documents via Google Patents) |
|---|---|
| Title | Electron diffraction voltmeter |
| Inventors | Gertrude F Rempfer |
| Company | Gertrude F Rempfer |
| Filing date | 1963-12-23 |
| Grant date | 1967-10-31 |