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| All Patents in class 403/66 | |||||
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| Number | Date | Patentee | Title | Type | |
| 264,859 | Sep. 26, 1882 | J.C. Butterfield | Atmospheric hammer | drop hammers | |
| 2,327,229 | Aug. 17, 1943 | L. Vavrik, K.C. Atkin | Surface treating machine | sanding machines | |