Patent classifications
E
FIXED CONSTRUCTIONS
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E04
BUILDING
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E04B
GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
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5/00
Floors; Floor construction with regard to insulation; Connections specially adapted therefor
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E04B5/48
Special adaptations of floors for incorporating ducts, e.g. for heating or ventilating
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