283 A.2d 154 CONSOLIDATED MECHANICAL CONTRACTORS, INC. v. BALL ET UX. [No. 45, September Term, 1971.]Court of Appeals of Maryland. Decided November 10, 1971. WITNESSES — Experts — Opinion Of An Expert Generally May Not Be Based In Whole Or In Part On Opinions, Inferences And Conclusions Of Other Witnesses Nor On Reports And Examinations […]