Copyright © Françoise Herrmann
On April 21, 1994, Karl Birkenstock was awarded German patent, DE4235261, for: Footwear in form of sandals, shoes, slippers, mules, trainers or clogs - has upper consisting of interlocking strips of material with matching cut out parts and attachments , considerably widening the scope of the invention. And, according to the Figures (I do not read German…), the sandal looks very much like a modern iteration of your beloved, corky cumfy Berkies….
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