Rotary or oscillatory slide valve-gear or valve arrangements, specially adapted for machines

Official title: Rotary or oscillatory slide 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)

F01L33/00 (Rotary or oscillatory slide valve-gear or valve arrangements, specially adapted for machines) appears on 38 US grants and 12 published applications in this corpus.