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https://www.zenitcamera.com/archive/history/masters-of-optics.html
yranslation
Of great importance for the improvement of photographic production was the proposal of Nikolai Mikhailovich Marenkov - Combine the upper cover of the outer casing, the casing of the curtain, the objective plateau and the camera's rangefinder case into one cast piece. (Previously, these parts were manufactured separately and attached to each other.) To assess the economic effect of the introduction of this proposal, you need to imagine that the top cover of the camera passed 19 mechanical and finishing operations. The body of the curtain shutter had 18 mechanical operations. Only by reducing the mechanical processing of parts on each machine, the time savings was 46 minutes. And this is without taking into account the release of workers, machine tools, the elimination of assembly and fastening of these parts. In monetary terms, the total savings during the transition to casting was at least 200 thousand rubles a year.
Such a solid body was used in the development of new plant equipment. (Page 114)
Year 1957
