238 N.W. 542 BERTHA M. KNAPP, Appellant, v. MARK D. BALDWIN et al., Appellees. No. 41019.Supreme Court of Iowa. October 20, 1931. MECHANICS’ LIENS: Operation and Effect — Vendor’s Lien — When 1 Superior to Mechanic’s Lien. A vendor’s lien for the purchase price of land sold on installments without obligating or requiring the vendee […]