din-108-56
幻灯片放映机与幻灯片 第56部分:通用及影院用幻灯片框 — 认证方案
Slide projectors and slides — Part 56: Slide frames and lantern slides for general use and for theatre projection — Certification scheme
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Slide projectors and slides — Part 56: Slide frames and lantern slides for general use and for theatre projection — Certification scheme
Slide projectors and slides; projector slides for general use and for theatre projection, nominal sizes, dimensions of masks, picture position and marking