This round slider rule has beautiful color and is marked with the name of the Dutch inventors. Made of plastic with minimal signs of use. Made in the Netherlands around 1965 when during the cold war everyone was talking about radiation and nuclear bombs. It was made for the Dutch civil defence and the PTT was part of the dutch Government and in charge of printing and delivery. Fully functioning and in great condition, hardly signs of use or age. Diameter of the disk is ca. 14 cm or 5 1/4 inches wide. . Check the attached video on how to work your vintage man tool : slide rule operation instructions!
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PTT Röntgen circular Slide rule case 1960 Holland
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PTT Röntgen circular Slide rule case made ca. 1960 Holland
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