of which some are placed around others in such a way that they damp each other by mutual friction

Full Title

Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic ( ; if including fluid springs F16F5/00, F16F13/00) > with springs made of steel or of other material having low internal friction > composed only of wound springs > of which some are placed around others in such a way that they damp each other by mutual friction