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Yarn Calculator : Closely Estimate Yarn for Your Crochet Projects

The post Yarn Calculator : Closely Estimate Yarn for Your Crochet Projects appeared first on Jera's Jamboree. Ready to stop ...
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Calculator card, American Viscose, Yarn strength calculator; 1967

Calculator card, sleeve with cut-outs exposing numbers on sliding card. Printed, "fmc / CORPORATION [logo]...AMERICAN / VISCOSE DIVISION...YARN STRENGTH CALCULATOR". American Viscose Co., 1967. Card ...