Lift valve-gear or valve arrangements specially adapted for machines or engines with

Official title: Lift valve-gear or valve arrangements specially adapted for machines or engines with variable fluid distribution (drive, adjustment during operation, tripping-gear, reversing-gear, use of working pistons or piston-rods as valves or as valve-supporting elements, valve-gear or valve arrangements peculiar to free-piston machines or engines F01L15/00 - F01L31/00)

F01L35/00 (Lift valve-gear or valve arrangements specially adapted for machines or engines with) appears on 12 US grants and 6 published applications in this corpus.