Patent classifications
A
HUMAN NECESSITIES
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A43
FOOTWEAR
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A43B
CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
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23/00
Uppers; Boot legs; Stiffeners; Other single parts of footwear
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A43B23/28
Devices to put in shoes in order to prevent slipping at the heel or to prevent abrading the stockings
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