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| Patents for Eric Hartmann | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,764,191 | Sep. 25, 1956 | E. Hartmann | Dove-tail template | dovetailing machines | |
| 2,765,824 | Oct. 09, 1956 | W.A. Papworth, E. Hartmann | Portable power operated saw | handheld circular saws | |
| 2,774,292 | Dec. 18, 1956 | E. Hartmann | Earth conditioning device | ||
| 2,830,411 | Apr. 15, 1958 | E. Hartmann | Reciprocating sanding machine | handheld power sanders | |