| All Patents in class 251/297 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 295,676 | Mar. 25, 1884 | G. Ross | Air-pump | |
| 608,243 | Aug. 02, 1898 | F.D. Winkley | Oil-hole cover or cap | oil or grease fittings |
| 682,550 | Sep. 10, 1901 | E.K. Hill, L. Kaczander | Oiler | industrial machine lubrication |
| 1,945,657 | Feb. 06, 1934 | F.F. Rike | Valve | heavy vehicles |
| 2,019,486 | Nov. 05, 1935 | L.F. Nenninger, H. Ernst | Hyraulically Propelled Machine Tool | hydraulic apparatus |
| 2,170,304 | Aug. 22, 1939 | C. Herfurth | Truing Attachment | grinding machines |
| 4,416,338 | Nov. 22, 1983 | M.L. Foster, R.R. Zuzinec, J.W. Nelson | Control Mechanism for a Pneumatic Tool | |
