@misc{HeimMenschSchiffler2018, author = {Jens Heim and Sergej Mensch and Andreas Schiffler}, title = {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)}, url = {https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/9972956}, type = {misc}, year = {2018}, }