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Seagull Hai Ou Pai 6531 vector log slide rule case Beijing 1970 China
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Seagull Hai Ou Pai 6531 vector log slide rule case Beijing, made ca. 1970 in China
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Description
This is Hai Ou Pai with Seagull logo is one of the few slide rules made by the Beijing Slide rule company in China. It is a high quality vector Log slide rule version named model 6531. It is in great condition and comes in the complete original and signed container. No cracks or chips, minmal signs of use / age. The build is very similar to the Faber Castell 2/83 and 2/82 models, completely made of plastic with metal ends and a plastic cursor with metal edges. It measures ca 33,5 cm or 13.5 inches in length. Check out the attached video on how to operate a vintage slide rule!
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