“PPM Technology”. Parry People Movers. 2017年12月28日時点のオリジナルよりアーカイブ。2010年6月30日閲覧。 “The rotating flywheel is a store of kinetic energy that is used to power the vehicle. ... flywheel allows the direct capture of brake energy ... A two-litre engine to transport fifty passengers. ... on board LPG-fuelled automotive engine is used.”
patents.google.com
W. H. Patton, Motor for Street Cars, アメリカ合衆国特許第 409,116号, granted Aug. 13, 1889.
“PPM Technology”. Parry People Movers. 2017年12月28日時点のオリジナルよりアーカイブ。2010年6月30日閲覧。 “The rotating flywheel is a store of kinetic energy that is used to power the vehicle. ... flywheel allows the direct capture of brake energy ... A two-litre engine to transport fifty passengers. ... on board LPG-fuelled automotive engine is used.”