eGVybw%3D%3D - zipp
- parallel computer processor
- parking meter
- pendulum clock
- Percy L Spencer
- Peter Goldmark Elihu
- photoelectric cell
- photoengraving
- photoengraving process; Benjamin Day
- photographic camera
- photography on metal
- photography on paper
- physical therapy developed by Ida Rolf
- piston steam engine
- pneumatic tires
- Polaroid camera
- polymeric chain reaction
- polyurethane
- posture therapy developed by Moshe Feldenkrais
- power loom
- projected motion pictures
- propeller
- punched cards
- radar
- radio
- radio telescope
- railway car couplings
- railway sleeping cars
- rayon
- reaping machine
- reflecting telescope
- refracting telescope
- Rene Theophile- Hyacinthe Laennec
- repeating rifle
- respirator
- revolver
- Richard Arkwright
- Richard Hoe
- Richard J Gatling
- Richard Roselle
- Richard Trevithick
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