139 A.2d 730 CHARLES H. STEFFEY, INC. v. HIGH [No. 168, September Term, 1957.]Court of Appeals of Maryland. Decided March 26, 1958. EVIDENCE — Expert Testimony — Admissibility, Test Of. A person who is qualified by study or experience, or both, to understand and explain the subject under consideration, may testify as to the manner […]