International Patent Classification E02B 3/12

<body id="einspalter"> <div> <a href="/ipc/ipcheader.do" title="Header area">Header area</a> </div> <div> <a href="/ipc/nipc.do?s=E02B0003120000&v=20230101&l=DE&dh=dh11#E02B0003120000" title="Navigation area">Navigation area</a> </div> <div> <a href="/ipc/cipc.do?s=E02B0003120000&v=20230101&l=DE&dh=dh11#E02B0003120000" title="Content area">Content area</a> </div> </body>