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the copier market. The breakthrough was the development of a paper superior to the former light-sensitive coated blueprint paper that had short shelf lives.
*1927: Louis van der Grinten invents an ammonia-free, diazo-copying process for technical drawings. In contrast to the earlier paper, the new paper had no so-called azo components. To emphasize this user-friendly aspect compared with the competitors, Van der Grinten called the paper O.C. (Ohne Componente).
*1927:

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