20 Supplement to Official Gazette (iii) [13th March] control or regulation otbroadcasting services or telecommunication services and other Iicensed activities where it is necessary in the interest of public security; (iv) specification, manner of installing and use of broadcasting apparatus and telecommunication apparatus~ (v) erection and placement of broadcasting apparatus and telecommunication apparatus and construction of works under this Act in so far as they affect land, buildings and other property, including their maintenance, alteration and removal: ., " •.<'i:·;~;,·:",'(.yW purchase 'and taking'over by the Goverlll;,ent of any broadcasting service ortelecommunication service where it is considered necessary in the national interest: (vii) taking over or requisitioning of any telecommunication installation where it is considered necessary for the preservation of publ ic secLlrity or in the national interest: (viii) control and orderly use of radio frequency bands. in accordance with internati(' .• lations: ~1 (ix) conditions and tariffs relating to allocation of radio frequencies to licensees: (x) prevention of misuse of broadcasting services or telecommunication services: (xi) reduction of transmitting power so as to prevent interference or interruption of other transmission; (xii) limitingthe liability ofl.icensees forwilful tailure to render services under the licence and