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Patent Drawing of Engine - US952706-0 - . Public domain  image

Patent Drawing of Engine - US952706-0 - . Public domain image

Internal combustion engine Deutsch: Doppelkolbenmotor

Patent Drawing of Engine - US2014678-Figure2 - . Public domain  image

Patent Drawing of Engine - US2014678-Figure2 - . Public domain image

Internal combustion engine with Compressor Deutsch: Doppelkolbenmotor nach Arnold Zoller (1882-1934)