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| All Patents in class 356/618 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,415,627 | May 09, 1922 | G.E. Giambiasi | Optical Scale for Vernier Measurements | rule graduations | |
| 2,720,810 | Oct. 18, 1955 | J.A. Senn | Measuring Instrument | milling machine accessories | |