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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E04D1/02
Grooved or vaulted roofing elements
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E04D1/04
of ceramics, glass or concrete, with or without reinforcement
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