8979. Wilson, W. G., and Wilson & Pilcher. April 17. Checkvalves.-A valve c, .specially applicable for use as an induction valve for a vapour or explosion engine for a motor road vehicle, has its spindle d screwed to receive a long nut e, which is secured by a pin h placed near one end of the nut. The uppermost coils of the valve spring f keep the pin in position.