322 A.2d 403 Calcite Quarry Corporation and Pennsylvania Manufacturers’ Association Insurance Co., Insurance Carrier, Appellants, v. Workmen’s Compensation Appeal Board and John Z. Fry, Appellees. Commonwealth Court of Pennsylvania.Argued March 7, 1974 July 18, 1974. Workmen’s compensation — Sufficient evidence — Stipulation — Recollection of referee — Accident — Unusual strain doctrine — Unusual working […]