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Produced by	Model	Year	Innovative characteristic	Picture
Gomz	Sport	1935	1° world reflex 135 (?) , though with Loupe finder
Ihagee	Kine Exakta	1936	1° with advance lever, speeds from 12 sec to 1/1000, first 135 SLR system
Veb Pentacon	Praktiflex	1939	First to use a prism (removable), 40mm screw mount lenses.