. . . . "225a, 31-231a, 31-232b, 31-232d, 31-232f, 31-236, 31-250a, 31-259, 31-263, 31-264a and 31-274j are hereby made securities in which public officers and public bodies of the state and its political subdivisions, all insurance companies, credit unions, savings and loan associations, investment companies, banking associations, trust companies, executors, administrators, trustees and other fiduciaries" . .