| All Patents in class 29/221 |
Patents 1 -
15
of 26
      |
| Number | Date | Patentee | Title | Type |
| 982,539 | Jan. 24, 1911 | W.H. Shimpf | Spring Holding Device For Valves | valve spring tools |
| 1,044,517 | Nov. 19, 1912 | B.C. Hallgren | Valve Lifting Device | valve spring tools |
| 1,045,321 | Nov. 26, 1912 | P.F. Pilliner | Valve Spring Compressor | valve spring tools |
| 1,105,096 | Jul. 28, 1914 | S.C. North | Tool for Removing Engine Valves | valve spring tools |
| 1,234,967 | Jul. 31, 1917 | C.O. Throp | Valve Removing Tool | valve spring tools |
| 1,330,542 | Feb. 10, 1920 | H.W. Kulp | Valve Spring Lifter | valve spring tools |
| 1,333,966 | Mar. 16, 1920 | W.B. Fay | Lifting Jack | valve spring tools |
| 1,359,814 | Nov. 23, 1920 | M.C. Dellinger, H.W. Kulp | Valve-spring lifter | valve spring tools |
| 1,444,729 | Feb. 06, 1923 | D.E. Carlson | Valve Spring Lifter | valve spring tools |
| 1,447,447 | Mar. 06, 1923 | J.E. Wainwright | Valve Lifting Device | valve spring tools |
| 1,461,275 | Jul. 10, 1923 | M.C. Dellinger, H.W. Kulp | Valve Spring Lifter Lock | valve spring tools |
| 1,553,623 | Sep. 15, 1925 | J.H. McLeod | Parallel Valve Spring Lifter | valve spring tools |
| 1,588,504 | Jun. 15, 1926 | J. Sunnen | Valve Lifter | valve spring tools |
| 1,608,176 | Nov. 23, 1926 | J.A. Anderson, W.F. Hobbs | Valve Lifting Tool | valve spring tools |
| 1,614,300 | Jan. 11, 1927 | J.A. Anderson, W.F. Hobbs | Valve Lifting Tool | valve spring tools |
