https://m-konstruktor.com/steel-moulds-and-concrete-equipment/parabolical-concrete-cunette-moulds/tpost/ixb89l40x1-features-of-the-parabolical-concrete-cun
Features of the parabolical concrete cunette moulds
As the saying goes, make hay while the sun shines, and parabolical concrete channels... in winter.
of thefeaturesparabolicalconcretecunette