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| Patents for J. M. Spencer | |||||
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| Number | Date | Patentee | Title | Type | |
| 828,482 | Aug. 14, 1906 | H.L. Johnston | Support for vehicle-canopies | ||
| 1,080,066 | Dec. 02, 1913 | H.L. Johnston | Refining-machine for coffee and the like | coffee cleaners | |