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| Patents for Plessisville Foundry Ltd. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,431,434 | Oct. 10, 1922 | O. Tardif | Sawing machine | circular sawmills | |
| 1,748,906 | Feb. 25, 1930 | O. Tardif, L. Carrier | Lath machine | lath making machines | |
| 2,090,324 | Aug. 17, 1937 | J. Boisvert | Road grader attachment | graders and dozers | |
| 2,174,116 | Sep. 26, 1939 | G.A. Bilocq | Stone crusher | stone crushers | |
| 2,232,431 | Feb. 18, 1941 | G.A. Bilocq | Rotating elevator | stone crushers | |