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| All Patents in class 33/611 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,952,965 | Mar. 27, 1934 | L.O. Beard | Instrument for measuring tappet-valve length while grinding valves and seats | valve and seat maintenance | |
| 2,557,840 | Jun. 19, 1951 | F.W. Preslan | Valve Seat Gauge | ||
| 3,869,803 | Mar. 11, 1975 | M.E. Vaughan | Drill guide for enlarging engine valve stem guides | automotive tools | |