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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A43B13/00 Soles; Sole-and-heel integral units
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A43B13/14 characterised by the constructive form
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A43B13/18 Resilient soles
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A43B13/20 Pneumatic soles; filled with a compressible fluid, e.g. air, gas
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