Cut Off Adjustable Relative To Admission Patents (Class 91/252)
Inlet controlled by relatively cyclically moved elements (Class 91/253)
Biased inlet valve with adjustable tripping means (Class 91/260)
Adjustable cam or cam follower actuated inlet valve (Class 91/262)
Adjustable fluid control for fluid actuated inlet valve (Class 91/263)

There are no patents to show for this class.