US Patent: 1,365,779
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| Indicating Calipers
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Patentee:
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| Thomas E. Grove (exact or similar names) - Dayton, OH |
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Patent Dates:
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| Applied: |
Mar. 25, 1918 |
| Granted: |
Jan. 18, 1921 |
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Patent Pictures:
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Thomas E. Grove patent Jan. 18, 1921 |
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Stan Schulz
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Description: |
| "Micro-indicating" calipers: "The instrument is designed to indicate slight variations of measurement upon a magnified scale."
A contemporary trade journal write-up describes the tool's use in conjunction with a micrometer to verify the internal dimensions of holes.
A known example is marked, "Grove Mfg. Co. Dayton O. Pat. Pend." |
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