avm fritz!box 3272
This image is kindly provided by Sennheiser electronic GmbH & Co. KG for use on this page. ©2008. Copying or reprinting this image is contrary to Sennheiser usage policy. Types There are different types of MD 421, the main difference between them being the type of connector fitted. The models are: MD421 N. With the so-called closing, the merger of the two world market leaders, KARL MAYER and STOLL, was officially completed on 1st July 2020. KARL MAYER is now the leading provider of solutions for the stitch-forming processes, flat knitting and warp knitting. Genuine enabler of sustainable world progress and opportunity, defined by the brand attributes of global leadership, innovation and sustainability..