Patent classifications
E
FIXED CONSTRUCTIONS
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E04
BUILDING
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E04C
STRUCTURAL ELEMENTS; BUILDING MATERIALS
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5/00
Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
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E04C5/16
Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
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E04C5/20
of material other than metal or with only additional metal parts, e.g. concrete or plastics spacers with metal binding wires
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E04C5/203
Circular and spherical spacers
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