Percussion tools having a reciprocable hammer piston...
Percussion tools incorporating a combustion cylinder for...
Percussive tool
Performance control of a motor vehicle engine for consistent...
Performance enhanced gas turbine powerplants
Permanent magnet pulse generator and method of forming and...
Petrol saving structure of a motor vehicle
Petroleum oil vaporizer
Pfbc power plant
Phase change heat engine
Phase relation control
Phasing gears for rotary engine of trochoidal design
Photo-electric ignition circuit for internal combustion engines
Pico fuel injector valve
Piezoelectric fuel injector-ignitor system for internal...
Piezoelectric ignition system having a magnetically actuated...
Piezoelectric voltage generator
Pile hammers and like percussion machines
Pile-driving device
Pile-driving ram