US Patent: 520,000
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| Mining Tool
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Patentee:
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| Martin Hardsocq (exact or similar names) - Ottumwa, IA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 10, 1893 |
| Granted: |
May 15, 1894 |
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Patent Pictures:
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Martin Hardsocq patent May 15, 1894 |
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Stan Schulz
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Description: |
| The patent is for interchangeable heads on mining tools like picks and hammers. The attaching means is a socket head screw. The patent includes the matching wrench as shown in the drawings and noted in the specifications. |
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