US Patent: 1,954,034
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| Equalizing boring guide
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Patentee:
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| Ewald A. Arp (exact or similar names) - Minneapolis, MN |
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Patent Dates:
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| Applied: |
Oct. 15, 1930 |
| Granted: |
Apr. 10, 1934 |
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Joel Havens
"Vintage Machinery" entry for Van Norman Machine Tool Co.
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Description: |
| Patent number seen on a Van Norman "Per-Fect-O" 77/S4 boring bar, along with patents 1,868,440, 1,881,993, and 1,906,241.This invention is an improvement on patent 1,868,440 |
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