US Patent: 1,001,471
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Micrometer Calipers
Direct-Reading Micrometer
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Patentee:
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| Frank Spaulding (exact or similar names) - Providence, RI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 27, 1909 |
| Granted: |
Aug. 22, 1911 |
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Ralph Brendler
"Vintage Machinery" entry for Brown & Sharpe Mfg. Co.
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Description: |
| This micrometer uses a series of internal gears to display the measurement as numbers instead of using a vernier. |
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