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Artist's Copyright has not to be cleared

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Keywords: 1930s, 20th, century, communication, communications, drawing, feldhellschreiber, germany, hell, hellschreiber, historic, historical, information, invention, inventions, mail, post, rudolf, scheme, schemes, siemens, technics, technologies, technology, telecom, telecommunication, telecommunications, telegraphy, teleprinter, teleprinters, transfer