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| Patents for H. J. Heydenburg | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 867,723 | Oct. 08, 1907 | J.P. Hedstrom | Machine for sharpening saw-teeth | |
 | 991,503 | May 09, 1911 | J.P. Hedstrom | Carriage for gang-saw-sharpening machines | |
 | 1,022,479 | Apr. 09, 1912 | J.P. Hedstrom | Rest for saw-sharpening machines | |
 | 1,031,711 | Jul. 09, 1912 | J.P. Hedstrom | Feed-finger mechanism | |
 | 1,031,712 | Jul. 09, 1912 | J.P. Hedstrom | Feed-finger mechanism | |
 | 1,038,127 | Sep. 10, 1912 | J.P. Hedstrom | Stretcher-rolls | |
 | 1,173,509 | Feb. 29, 1916 | J.P. Hedstrom | Swage | |