[Weiler GmbH - Concrete Extruder and Slipformer Machines and Plants for Prestressed Precast Hollow Core Concrete Slabs, Planks, Panels, Piles & Concrete Beams. Founded in 1954 with over 200 plants and 500 precast extruder and slipformer machines worldwide, Weiler GmbH manufactures machines and plants to produce precast, prestressed hollow core concrete slabs, concrete planks, wall panels, t beams, and architectural precast products.]