US Patent: 455,101
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| Tool Holder
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Patentee:
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| Ernst C. Heydenreich (exact or similar names) - Mount Clemens, MI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 22, 1891 |
| Granted: |
Jun. 30, 1891 |
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Patent Pictures:
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Ernst C. Heydenreich patent June 30, 1891 |
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Stan Schulz
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Description: |
| A head with a central threaded bit that can be adapted to multiple gripping and shaping functions. The functions noted in the specification are: "cupping set screws" "chamfering bolts" "using a wood screw as a gimlet." |
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