Tiles in this class, including concrete roofing tiles and ridge tiles; roof-guttering, down pipes and parts of and fittings for such guttering and downpipes, all being non-metallic; concrete and plastic panels for covering walls; concrete roof panels; concrete masonry bricks; concrete buildings structures and structural members namely bridge beams, piles, mullions, coluns, wharf units, spectator stands and roof, flooring, decking and wall units in this class; concrete and plastic tunnel linings; concreteposts and poles including electrical transmission and light poles and posts for fencing and for guardrails, pipes in this class; concrete tramway and railway sleepers; concrete paving blocks and slabs; concrete septic tanks, cable covers, tanks tubbing, water tanks, silos, manhole liner boxes including such liner boxes for telecommunication repeater units, manhole covers and Guttering for drainage and irrigation channels; concrete and plastic facing panels and members for retaining walls for earthworks and landscaping; aggregate and screenings in this class including polished aggregate and screening of crushed rock and stone; pre-mixed concrete

Plastic sheets or foils used on or in connection with steel or concrete work,

Concrete pipes for various industrial purposes, including water supply, drainage, sewerage and irrigation, and for lamp standards, septic tanks and well linings, and the following articles composed wholly or mainly of concrete, anchor blocks, box culverts, crib blocks for fences or retaining walls, fence posts, grease traps, guttering, incinerators, kerbing, manhole units, paving slabs, sewerage fittings, silo staves, water stave tanks, pretensioned beams and postensioned beams.