US Patent: 2,441,414
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Drill press
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Patent Dates:
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Applied: |
Oct. 27, 1945 |
Granted: |
May 11, 1948 |
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Jeff Joslin Vintage Machinery entry for N. A. Woodworth Co.
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Description: |
The primary innovation is a method of limiting the advance of the drill bit in a self-feeding drilling machine so as to prevent the bit from being damaged when it breaks through the workpiece which normally causes a large shock or jolt. |
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