175 A. 424 Koehler’s Estate. Supreme Court of Pennsylvania.September 25, 1934. November 26, 1934. Wills — Revocation — Evidence — Parol evidence — Unproduced written revocation — Act of June 7, 1917, P. L. 403. Under section 20 of the Wills Act of June 7, 1917, P. L. 403, a revocation of a will cannot […]