At ITMA 1999, Ruster, which is part of the Mayer Group, introduced a new type of control jack stamped from a single piece using a patented process and hardened on the ground. Other companies showed profile ground and precision stamped or blanked parts, such as high precision cylinder and dial tracks for circular knitting machines and needle beds for flat knitting machines. Kern-Liebers' new process for changing the surface structure of sinkers and sliders minimizes adhesion for easier movement. Harting KGaA's maximum productivity selection systems for precise single plane needle selection include the Monosystem for circular knitting machines that selects 100 needles per second. The LTG Clean-Knit-System for circular knitting machines removes fibers at the yarn feeders via directed air blasts that produces a laminar flow through the machine interior.