Deeds, conveyances and other instruments of writing of corporations entitled to registration, which have been heretofore duly executed in the manner required by law, by the proper officers of the  corporation, and which have prior to March 8, 1943, been admitted to registration, on the acknowledgment or proof of the proper executing officer, in the manner required by law, shall be, and the same are hereby declared to be, in all respects validly admitted to record, although such officer at the date of such acknowledgment or proof had ceased to be an officer of such corporation, or such corporation at the date of such acknowledgment or proof had ceased to exist. (1943, c. 598.)