Levin H. Campbell, Court ruling, Digital Equipment Corporation, Plaintiff, Appellant, v. Sidney A. Diamond, Etc., et al., 653 F.2d 701 (1st Cir. 1981), June 12, 1981; see paragraph 5 for the chronology of introduction.
Levin H. Campbell, Court ruling, Digital Equipment Corporation, Plaintiff, Appellant, v. Sidney A. Diamond, Etc., et al., 653 F.2d 701 (1st Cir. 1981), June 12, 1981.
patents.google.com
Thomas C. Stockebrand, Bidirectional Retrieval of Magnetically Recorded Data, U.S. patent 3,387,293, issued June 4, 1968.