Sales brochure Knotting and Braiding with Pyro Lace and Cord published by Pyrotex Corp. of Leominster, MA circa 1958
Good vintage condition: some staining on side of a few pages, see photos.
Pyrolace / Rexlace plastic cords and lacing available through:
https://pepperell.com/content/2021CatalogMasterCombined.pdf
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