Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B60
VEHICLES IN GENERAL
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B60B
VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
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33/00
Castors in general;; Anti-clogging castors
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B60B33/0036
characterised by type of wheels
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B60B33/0042
Double or twin wheels
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