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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1/00
Roof covering by making use of tiles, slates, shingles, or other small roofing elements
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E04D1/30
Special roof-covering elements, e.g. ridge tiles, gutter tiles, gable tiles, ventilation tiles
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E04D2001/304
at roof intersections, e.g. valley tiles, ridge tiles
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