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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3/00
Roof covering by making use of flat or curved slabs or stiff sheets
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E04D3/3601
of roof covering supported by the roof structure with interposition of a insulating layer
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E04D3/3603
the fastening means being screws or nails
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