Distributor duct for distribution of terrestrial heat, has concrete duct ring provided with circulating wall and opening in its wall for feeding multiple lines, where opening is waterproof closed by plastic component
DE102007028324A1
Concrete shaft for building site installation has upper ring resting on plastic strips over a lower ring
EP1270816A1
Paving element
DE10016099A1
Drainage shaft for highways and tunnels closes shaft runout chamber with overlapping cover plate joined to shaft frame via ring seal using surface-operated swivel bolt on cover plate underside to bolt plate down.
EP1119661A1
Shaped pavestone
US4792257A
Set of paving stones, particularly set of concrete paving stones
