Moody’s Investors Service has lowered American Medical...

Moody’s Investors Service has lowered American Medical International’s credit rating in light of an expected buyout of the firm to the speculative grade of BA3 from BAA2 . . . International Business Machines and Motorola signed an agreement for Motorola to participate in an IBM research and development effort on the use of X-rays in producing semiconductors . . . El Monte-based Birtcher Corp. said it signed a definitive agreement with C. R. Bard Inc. to purchase its Denver-based Bard/EMS electrosurgery division for about $11 million in cash.