US Patent: 411,444
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| Micrometer Calipers
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Patentee:
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| John M. Irmen (exact or similar names) - Atlantic, IA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 23, 1889 |
| Granted: |
Sep. 24, 1889 |
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Joel Havens
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Description: |
| My invention relates to improvements in calipers in which one jaw is stationary and the other actuated by a threaded rod; and the objects of my improvements are to provide calipers that are accurate, durable, and adapted to measure the caliber of small things, and of any short small thing that projects from a larger body.
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