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| Patents for R. T. Spencer | |||||
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| Number | Date | Patentee | Title | Type | |
| 614,348 | Nov. 15, 1898 | F.P. Rosback | Machine for making box-blanks | box making machines | |
| RE11,733 | Apr. 11, 1899 | L.L. Filstrup | Saw-sharpening machine | saw sharpening machines | |
| 628,655 | Jul. 11, 1899 | L.L. Filstrup | Saw-sharpening machine | saw sharpening machines | |