TY - GEN A1 - Heim, Jens A1 - Mensch, Sergej A1 - Schiffler, Andreas T1 - Connecting element having a recessed portion on top of one end and a recessed portion on bottom of the other end (Patent, US-9972956-B2) Y1 - 2018 UR - https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/9972956 ER -