"Trical", plastic circular slide rule with two vol

Made:
France

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Trical', plastic circular slide rule with two volvelles for knitting calculations, French, with instruction sheet'
Science Museum Group
© The Board of Trustees of the Science Museum

"Trical", plastic circular slide rule with two volvelles for knitting calculations, French, with instruction sheet

Details

Category:
Mathematics
Object Number:
1990-673
type:
circular slide rule (knitting)
credit:
Auction Team Koln

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