US Patent: 2,643,460
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| Hardness Testing Indicator
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Patentees:
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| Harry W. Dietert (exact or similar names) - Detroit, MI |
| William P. Adair (exact or similar names) - Mayfield Heights, OH |
| Elmer C. Zirzow (exact or similar names) - Cleveland Heights, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 09, 1948 |
| Granted: |
Jun. 30, 1953 |
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Joel Havens
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Description: |
| Whittemore, Hulbert & Belknap - patent attorneys
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