Interesting slide rule charts by IWA model 05 182 in German and English made for the Dutch BOA Nederland B.V. Company in The Netherlands in 1976. Can be used for calculation (back and front) for installation of carbon steel pipe. It is in very good condition so there are only small signs of use or age from normal use, fully functioning with all parts intact. It measures ca, 21 cm or ca. 10 inches wide. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
IWA 05182 Carbon steel pipe calculation slide rule chart 1976 Germany
IWA 05182 Carbon steel pipe calculation slide rule chart 1976 Germany / Holland
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