. . . Upjohn Co. said its...

. . . Upjohn Co. said its shareholders have approved two “poison-pill” measures aimed at protecting the giant drug and agricultural company from hostile takeover attempts. . . . Tyco Laboratories announced that it has repurchased 497,000 shares of its common stock on the open market since the end of April . . . Hitachi America introduced the electronics industry’s first complementary metal oxide semiconductor single-chip microcomputer with one-time electrically programmable read-only memory.