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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13/00
Special arrangements or devices in connection with roof coverings; Protection against birds;; Roof drainage; ; Sky-lights;
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E04D13/002
Provisions for preventing vegetational growth, e.g. fungi, algae or moss
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