| All Patents in class 29/219 |
Patents 16 -
27
of 27
      |
| Number | Date | Patentee | Title | Type |
| RE14,640 | Apr. 29, 1919 | R.A. Durland | Valve Spring Compressor | valve spring tools |
| 1,323,476 | Dec. 02, 1919 | G.W. Ingram | Valve Remover | valve spring tools |
| 1,328,228 | Jan. 13, 1920 | A.O. Feilbach | Tool For Lifting Valve Springs | valve spring tools |
| 1,332,128 | Feb. 24, 1920 | C.O. Wotring, H. Kvindlog | Valve-Lifter | valve spring tools |
| 1,346,416 | Jul. 13, 1920 | C.H. Newton | Valve Spring Compressor | valve spring tools |
| 1,357,954 | Nov. 09, 1920 | C.S. We Mett, E.S. Perkins, C.L. Clark | Valve Spring Compressor | valve spring tools |
| 1,365,468 | Jan. 11, 1921 | J.F. Duby | Valve Spring Lifter | valve spring tools |
| 1,720,802 | Jul. 16, 1929 | J. Sunnen | Compressor For Springs of Internal Combustion Engines | valve spring tools |
| 1,862,793 | Jun. 14, 1932 | M.C. Dellinger, H.W. Kulp | Valve Spring Lifter | valve spring tools |
| 1,913,084 | Jun. 06, 1933 | M.C. Dellinger, H.W. Kulp | Valve Spring Lifter | valve spring tools |
| 1,922,392 | Aug. 15, 1933 | S. Palmer | Valve Lifter | valve spring tools |
| 4,267,627 | May 19, 1981 | R. Douglas | Attachment for Valve Spring Depressing Tool | valve spring tools |
