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| Patents for H. P. Doolittle | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,247,798 | Nov. 27, 1917 | W. Dohn | Clothes-drying tumbler-machine | ||
| 1,268,277 | Jun. 04, 1918 | H.W. Ransdall | Lathe Turret | turret lathes | |