87 N.W.2d 767 CHRISTY A. NELSON et al., appellants, v. WILLIAM NELSON et al., appellees. No. 49383.Supreme Court of Iowa. February 11, 1958. EVIDENCE: Handwriting expert — when deemed substantive 1 evidence. The facts shown in support of the conclusions of a handwriting expert must be deemed substantive evidence rather than mere expert opinion. EVIDENCE: […]