Technical mammal for bathythermographs OC-1/S, OC-2/S, OC-3/S, OC-1A/S, OC-2A/S, OC-3A/S, OC-1B/S, OC-2B/S, OC-3B/S, OC-1C/S, OC-2C/S, OC-3C/S; Nov. 17, 1959.