67 (n) the establishment, maintenance, protection, working and conduct of all or any radiocommunication service established, maintained or carried on by a licensee, whether in conjunction with a telecommunication service or system or otherwise; (o) the prohibition, restriction or control, by licence or otherwise, of the importation, purchase and sale of any apparatus capable of causing harmful interference; (p) ensuring that— (i) the use of generating apparatus or power lines does not cause harmful interference and in so doing prescribe the conditions to be observed with respect to— A. the maximum intensity of electromagnetic energy of specified frequencies which may be radiated in any direction from generating apparatus or power lines when in use; B. the electromagnetic energy of specified frequencies which may be injected by generating apparatus into the power lines by means of which power is supplied to the generating apparatus; (ii) the use, in connection with a broadcasting or diffusion service or otherwise of radio stations or radio or other apparatus that does not injure or interfere with radiocommunication or telecommunication services established, maintained or carried on by a licensee or injure or interfere with radio stations or radio or other apparatus, equipment, circuits, instruments, wires and the like of a licensee, and in so doing authorise the Authority to order the modification of radio stations or the removal or replacement of radio or other apparatus; (q) the registration of dealers in and repairers of radio transmitting stations and the information to be supplied to the Authority in connection with applications for registration; (r) the keeping of books, records and documents, the furnishing of returns and the supply of information relating to dealings in and the repair of radio transmitting stations by dealers and authorised repairers; (s) the qualifications in respect of age, term of service, skill, character and otherwise required by applicants for certificates of competency to work prescribed classes and types of radio stations; (t) the holding of examinations to determine the proficiency of applicants for certificates of competency to work prescribed classes and types of radio stations; (u) the issue of certificates of competency referred to in paragraph (t) to persons with the qualifications prescribed in terms of that paragraph; (v) the fees to be paid— (i) by applicants in connection with examinations referred to in paragraph (t); and (ii) on the issue of certificates of competency to work prescribed classes and types of radio stations; (w) the form and manner in which applications for licences, certificates and authorities are to be made and the information to be supplied in connection therewith;