 (89a) OH Rotary Valve V 4 steam engine under construction
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 1967 Mazda Cosmo. Its improved rotary engine eventually bore little resemblance to the Wankel. From Malamut Auto Museum. (2104)
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 Mazda RX 8 Hydrogen Concept Car, rotary engine runs on hydrogen and gasoline, Then & Now (1391)
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 (89) Don Dickinson and his OH rotary valve V 4 Steam engine
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 1967 Mazda Cosmo Sport 110S, first vehicle mass produced with a twin rotary engine. Production began in 1967. (2102)
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 1967 Mazda Cosmo Sport 110S, first vehicle mass produced with a twin rotary engine. Courtesy of Malamut Auto Museum (2104)
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 1967 Mazda Cosmo Sport 110S, first vehicle mass produced with a twin rotary engine ... At Petersen Automotive Museum, L.A.(2104)
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 1967 Mazda Cosmo Sport 110S. Cosmo Sport was first production vehicle equipped with twin rotor rotary engine. (1281)
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 1967 Mazda Cosmo Sport 110S. The Cosmo Sport was the first production vehicle equipped with a twin rotor rotary engine. (1281)
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 Gnome rotary
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