E04D 3/18
Roof covering by making use of flat or curved slabs or stiff sheets of plane slabs, slates, or sheets, or in which the cross-section is unimportant of specified materials, or of combinations of materials, not covered by any of groups [CPC: E04D3/04], [CPC: E04D3/06] or [CPC: E04D3/16]
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