US Patent: 199,285
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| Improvement in mortising and boring machines
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Patent Dates:
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| Granted: |
Jan. 15, 1878 |
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"Vintage Machinery" entry for Greenlee Brothers & Co.
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Description: |
| The machine in this patent is considered the first successful hollow chisel mortiser design. This machine has two major differences from the typical American-designed hollow-chisel mortiser. First, it's a horizontal machine rather than vertical. Second, the drill and chisel enter the work from opposite sides. This is mechanically simpler but is limited to through-mortises only, plus bad things could happen if either drill or chisel gets deflected. |
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