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| Patents for Joseph G. Groff | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 247,558 | Sep. 27, 1881 | J.G. Groff | Circular-saw guard | |
 | 263,171 | Aug. 22, 1882 | J.G. Groff | Saw-guard | |
 | 264,149 | Sep. 12, 1882 | J.G. Groff | Guard for circular saws | |
 | 266,466 | Oct. 24, 1882 | J.G. Groff | Saw-guard | |
 | 277,711 | May 15, 1883 | J.G. Groff | Saw-guard | |
 | 278,130 | May 22, 1883 | J.G. Groff | Saw-guard | |
 | 284,199 | Sep. 04, 1883 | J.G. Groff | Saw-guard | |
 | 291,187 | Jan. 01, 1884 | J.G. Groff | Saw-guard | |
 | 307,112 | Oct. 28, 1884 | J.G. Groff | Saw-guard | |
| 311,486 | Feb. 03, 1885 | J.G. Groff | Saw-guard | ||