| Patents for H. J. Heydenburg |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 867,723 | Oct. 08, 1907 | J.P. Hedstrom | Machine for sharpening saw-teeth | saw sharpening machines |
| 991,503 | May 09, 1911 | J.P. Hedstrom | Carriage for gang-saw-sharpening machines | saw sharpening machines |
| 1,022,479 | Apr. 09, 1912 | J.P. Hedstrom | Rest for saw-sharpening machines | saw sharpening machines |
| 1,031,711 | Jul. 09, 1912 | J.P. Hedstrom | Feed-finger mechanism | saw sharpening machines |
| 1,031,712 | Jul. 09, 1912 | J.P. Hedstrom | Feed-finger mechanism | saw sharpening machines |
| 1,038,127 | Sep. 10, 1912 | J.P. Hedstrom | Stretcher-rolls | saw sharpening machines |
| 1,173,509 | Feb. 29, 1916 | J.P. Hedstrom | Swage | saw swages |
