With both elastically-deformable and rigid rolling elements

Official title: {with both elastically-deformable and rigid rolling elements, e.g. pneumatic-tyred compactor with selectively operative or inoperative steel-faced roll (with auxiliary elastically-deformable rolling elements for working only restricted zones E01C19/27; rigid-roll rollers with conventional pneumatic-tyred tractors or traction-units E01C19/25, E01C19/26, E01C19/28)}

E01C19/231 (With both elastically-deformable and rigid rolling elements) appears on 9 US grants and 13 published applications in this corpus.