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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E04D13/04
Roof drainage; Drainage fittings in flat roofs,; balconies or the like
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E04D13/08
Down pipes; Special clamping means therefor
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E04D2013/0853
Valves for controlling the rain water flow
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