Counties, cities, villages, incorporate towns, and other municipal corporations, political subdivisions and public bodies, and public officers of any thereof, all banks, bankers, trust companies, savings banks and institutions, building and loan associations, savings and loan associations, investment companies, insurance companies and associations, and all executors, administrators, guardians, trustees and other fiduciaries may legally invest any sinking funds, moneys or other funds belonging to them or within their control in any bonds issued pursuant to “An Act to authorize the issuance and sale of bonds of the State of Illinois for the purpose of obtaining funds to be used for making permanent improvements at educational institutions owned by this State and to provide for the payment of the principal of and interest upon said bonds”, approved July 23, 1959, or “An Act to authorize the issuance and sale of bonds of the State of Illinois for the purpose of obtaining funds to be used for making permanent improvements at mental health and other public welfare institutions owned by the State and to provide for the payment of the principal of and interest upon such bonds”, approved July 22, 1959, or any other general obligation bonds issued by the State of Illinois.