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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E04D13/03
Sky-lights; Domes; Ventilating sky-lights
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E04D13/035
characterised by having movable parts
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E04D13/0357
the parts pivoting about an axis supported on a hinged frame or arms
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