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E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
E04D13/17—Ventilation of roof coverings not otherwise provided for
E04D13/172—Roof insulating material with provisions for or being arranged for permitting ventilation of the roof covering
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CH244793D1944-10-211944-10-21
Process for waterproofing building structures by interposing sheets of plastic material based on synthetic resins.
CH244793A
(en)
Process for the production of a crystallizable glass material, in particular for use as an aggregate for building materials, in particular road materials.
Process for patching articles of plastic materials based on synthetic resins having holes or tears and in particular sheets, based on polyvinyl chloride and its copolymers.