Patent classifications
E
FIXED CONSTRUCTIONS
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E04
BUILDING
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E04D
ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
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7/00
Roof covering; exclusively consisting of; sealing masses applied in situ; Gravelling of flat roofs
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E04D7/005
characterised by loose or embedded gravel or granules as an outer protection of the roof covering
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