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| Patents for John Howell | |||||
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| Picture | Number | Date | Patentee | Title | |
| GB-179,602,113 | May 31, 1796 | J. Howell | Machine for boring wooden water pipes | ||
 | 14,705 | Apr. 15, 1856 | J.M. Kern | Method of adjusting circular saws for concave or convex work | |