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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21/00
Heels; Top-pieces or top-lifts
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A43B21/24
characterised by the constructive form
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A43B21/28
Pneumatic heels; filled with a compressible fluid, e.g. air, gas
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