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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E04D1/12
Roofing elements shaped as plain tiles or shingles, i.e. with flat outer surface
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E04D1/22
of specified materials; not covered by any one of groups E04D1/14 - E04D1/205; , or of combinations of materials,; where at least one is; not covered by any one of groups E04D1/14 - E04D1/205
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