US Patent: 159,652
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| Improvement in Tempering Steel Plates
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Patentees:
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| Henry Disston (exact or similar names) - Philadelphia, PA |
| Charles T. Shoemaker (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Feb. 09, 1875 |
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Russ Allen.
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Description: |
| Patent to rapidly harden or temper saw blades and other steel objects buy having them traverse down an inclined furnace flue. |
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