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| Patents for Robert Johnson | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 246,423 | Aug. 30, 1881 | E.H. Sawin | Tenoning-machine | |
 | 271,159 | Jan. 23, 1883 | C. Thompson | Drag-saw | |
 | CA-38,064 | Jan. 04, 1892 | R. Johnson | Machine Rotatoire, Machine Soufflante, Pompe et Compteur a Eau | |
 | 1,410,189 | Mar. 21, 1922 | R. Johnson | Calipers, Spring-Calipers and the Like | |