D. Puerto Rico March 1977 casesRuiz Rodriguez v. Litton Industries Leas. Corp.Perez Torres v. Secretary of Health, Ed. WelfareChadbourn-Caribbean Ind. v. Autoridad, Etc.Febo Agosto v. Secretary of Health, Ed. and WelfareHernandez Del Valle v. Santa AponteGarcia Mendez v. Vazquez BrunoPierluisi v. E.R. Squibb Sons, Inc.