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lichtdicht packaged role lichtempfindlichem material.
lichtdicht packaged role lichtempfindlichem material.
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机译:防光包装的光敏材料的作用。
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摘要
A light-tightly packaged roll of light-sensitive material, which comprises an annular end cover for each end face of the roll and a circumferential cover wound around the periphery of the roll and having lateral extensions sealed with their inner surface to the inner surface of radially outwardly projecting margins of the end covers.
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