E04D3/361- Connecting Fastening by specially-profiled marginal portions of the slabs or sheets.E04D3/00- Roof covering by making use of flat or curved slabs or stiff sheets.E04D13/0305- Supports or connecting means for sky-lights of flat or domed shape.E04D13/03- Sky-lights Domes Ventilating sky-lights. ![]()
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