Abstract: A heat exchanger for an internal combustion engine includes a base tube having opposite ends, and tube plates respectively provided at the ends of the base tube. A ring embraces the base tube. The ring is made of sheet metal and has legs extending toward one another in a V-shaped manner. An end cap is provided in the region of each tube plate and has a circumferential outwardly directed rim which is embraced by a tension element and connected to the ring.

Abstract: A grinding tool for natural stone floors, artificial stone floors and industrial floors allows a greatest possible adaptation to the unevennesses of worn natural and artificial stone floors to be restored by using diamond tools that are flexibly attached. The diamond tools are fixed on a mat so that each individual diamond tool can adapt individually to the grooves and unevennesses of an animated natural stone and stone floor. The grinding pattern of a surface machined with said grinding tool corresponds to a newly produced natural stone or artificial stone floor.

Abstract: A grinding tool for natural stone floors, artificial stone floors and industrial floors allows a greatest possible adaptation to the unevennesses of worn natural and artificial stone floors to be restored by using diamond tools that are flexibly attached. The diamond tools are fixed on a mat so that each individual diamond tool can adapt individually to the grooves and unevennesses of an animated natural stone and stone floor. The grinding pattern of a surface machined with said grinding tool corresponds to a newly produced natural stone or artificial stone floor.