Pr2 or pr, i.e. partial response class 2, polynomial 2=1+2d+d2

Official title: {PR2 or PR(1,2,1), i.e. partial response class 2, polynomial (1+D)2=1+2D+D2}

G11B20/10101 (Pr2 or pr, i.e. partial response class 2, polynomial 2=1+2d+d2) appears on 107 US grants and 100 published applications in this corpus.