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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5/00
Roof covering by making use of flexible material, e.g. supplied in roll form
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E04D5/14
Fastening means therefor
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E04D5/149
fastening by welding
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