Made of steel or other material having low internal friction

Official title: made of steel or other material having low internal friction {(characterised by their special construction from fibre-reinforced plastics F16F1/366; spring units consisting of several springs F16F3/02; making springs from wire B21F35/00)}; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant

F16F1/02 (Made of steel or other material having low internal friction) appears on 2,800 US grants and 2,608 published applications in this corpus.