261 S.E.2d 470 NEW CONCEPT PHYSICAL FITNESS CENTERS, INC. v. ALLEN ADVERTISING, INC. 58533.Court of Appeals of Georgia.SUBMITTED SEPTEMBER 6, 1979. DECIDED OCTOBER 12, 1979. DEEN, Chief Judge. Where the appellant has evidence in its possession at the time of trial and knows that it possesses such evidence and does not avail itself of it, […]