Special Radio Electronics circular slider rule the large version, made by ALRO (All-round) and comes in it’s complete metal case. Made in Holland in The Hague around 1950 after the patents were received, so this is the later model. The slide rule and it’s parts are original. Everything is in good working condition with signs of use and age and a small piece missing from the decal in the top part. Closed it measures ca 13,5 cm or 5 3/8 inches wide. See pictures for details. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
Alro Muiderkring Radio Electronics slide rule metal case 1950 Holland
Alro Muiderkring Radio Electronics circular Slide rule in metal case made ca. 1950 in Holland
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