US Patent: 2,814,124
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| Indicator device
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Patentee:
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| John L. Blake (exact or similar names) - Arcadia, CA |
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Patent Dates:
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| Applied: |
Dec. 12, 1955 |
| Granted: |
Nov. 26, 1957 |
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Joel Havens
Blake Manufacturing Co. website
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Description: |
| See also Canada patent CA-579,314. This patent covers the Blake Co-Axial Indicator, which is used to measure concentricity, such as when positioning a round hole under a spindle. As of 2017 this indicator is still being made by the original manufacturer. Inferior offshore copies are also available. |
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