| Patents for Armstrong Mfg. Co. (Portland) |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 1,169,377 | Jan. 25, 1916 | W.C. Barnhart | Grinding-machine | bandsaw accessories |
| 1,394,704 | Oct. 25, 1921 | W.C. Barnhart | Pulley-grinding machine | bandsaw accessories |
| 1,551,230 | Aug. 25, 1925 | E.P. Armstrong | Hand-operated circular-saw sharpener and gummer | saw sharpening machines |
| 1,771,602 | Jul. 29, 1930 | E.P. Armstrong, R.S. Jackson | Grinder for Concave Saw Teeth | saw sharpening machines |
| 1,824,349 | Sep. 22, 1931 | R.G. Horton, G. Fraley | Power attachment for saw swages | saw sharpening machines |
| 1,881,761 | Oct. 11, 1932 | O.J. Lougheed | Welding clamp | bandsaw brazing and welding machines |
| 2,627,708 | Feb. 10, 1953 | C.C. Walker, Sr., M.H. Mater | Method of truing the peripheral surfaces of band saw wheels | bandsaw accessories |
