All mortgages given prior to March 9, 1928 by any public utility company, hydroelectric company or manufacturing company to any person whomsoever, covering the whole or any part of its real or personal property, all chattel mortgages executed prior to April 26, 1935 to a production credit association or to the governor of the Farm Credit Administration and all mortgages executed prior to April 4, 1949 by the State Rural Electrification Authority or by a cooperative organized under or subject to the provisions of Electric Cooperative Act and now of record in the office of the clerk of court or register of deeds of any county in this State are hereby validated although the description of the property mortgaged be in whole or in part in printing, mimeographing or any other process of reproduction.