1) Exercise equipment 
The Bullworker is an isometric exercise device used for strength training originally marketed and sold in the early 1960s. Designed and patented by German inventor Gert F. Kölbel, it continues to sell in Europe, Asia and the U.S.A. Over 9 million units have been sold worldwide. The original Bullworker consists of two sleeved, spring-loaded, teles...