| All Patents in class 29/220 |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| 884,751 | Apr. 14, 1908 | C.W. Birchwood, G.B. McBean | Repair Tool | valve spring tools |
| 977,245 | Nov. 29, 1910 | P.C. Wiest | Valve Remover | valve spring tools |
| 1,034,874 | Aug. 06, 1912 | G.F. Clark | Device For Removing Valve Springs | valve spring tools |
| 1,236,826 | Aug. 14, 1917 | R.A. Durland | Valve Spring Compressor | valve spring tools |
| 1,245,667 | Nov. 06, 1917 | C.J. Bousfield | Device For Removing Puppet Valves | valve spring tools |
| 1,279,017 | Sep. 17, 1918 | H.M. Schnabel | Valve Lifter For Automobiles | valve spring tools |
| RE14,640 | Apr. 29, 1919 | R.A. Durland | Valve Spring Compressor | valve spring tools |
| 1,317,320 | Sep. 30, 1919 | J.B. Rose | Jack | valve spring tools |
| 1,339,422 | May 11, 1920 | A.C. Rosenbrook | Valve Tool | valve spring tools |
| RE15,162 | Jul. 26, 1921 | C.J. Bousfield | Device For Removing Puppet Valves | valve spring tools |
| 1,855,461 | Apr. 26, 1932 | A.H. Yordi, C. Tennyson | Valve Spring Compressor | valve spring tools |
