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| Patents for Howard W. Bartholomew | |||||
| Number | Date | Patentee | Title | Type | |
| 2,069,299 | Feb. 02, 1937 | H.W. Bartholomew | Milling Machine | milling machines | |
| RE20,893 | Oct. 25, 1938 | H.W. Bartholomew | Milling Machine | milling machines | |