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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1/00
Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
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E04B1/38
Connections for building structures in general
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E04B1/58
of bar-shaped building elements
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