The “Singold gerätetechnik” company was founded in 1970 by Dipl. ing. Erwin Lüer in the Bavarian village Hiltenfingen. The reason for the establishment of the company was the lack of appropriate equipment for bulk material plants. Erwin Lüer invented and developed the world’s first pneumatic knocker of its kind. Even today – 50 years later – the pneumatic knockers from Singold are the most efficient on the market.