ales had grown so much by 1952 that they opened a factory in Munich. In 1959, the company had grown large enough that Märtens and Funck looked at marketing the footwear internationally. Almost immediately, British shoe manufacturer R. Griggs Group Ltd. bought patent rights to manufacture the shoes in the United Kingdom.[4] Griggs anglicised the name, slightly re-shaped the heel to make them fit better, added the trademark yellow stitching, and trademarked the soles as AirWair.
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