https://www.sedgeochem.uni-bremen.de/luer%20connector.html#:~:text=the%20female%20piece%20typically%20has,of%20its%20length%20(5mm).[/URL]]This is not an official reference document ! For a proper description of the luer lock standard please refer to ISO 594-2(1998), ISO 80369 or DIN / EN 1707:1996 or newer standards, which are all based on the original patents of H.A.Wülfing-Lüer. His wife Jeanne Amélie Lüer most likely invented the luer slip connection in the late 19th century (first syringe patent: FR 242646, 1894, US Patent US 583382 from 1897..) and the rotating cap luer lock standard is based on a publication by A.Ravin from 1952.