6 No. 18 Tanzania Communications 1993 ''Director General'' means the Director-General of the Commission appointed under section 8(2). ''equipment'' includes any appliance, apparatus or accessory used or intended to be used for telecommunication or postal purposes; ''Hertian or radio waves'' means electro-magnetic waves of frequencies not exceeding 1,000 tetahertz propagated in space without any artificial guide; "installation or plant used for posts'' includes all buildings, lands, structures, machinery, equipment, boxes and receptacles used or intended for use in connection with the transmission of postal articles by post; ''installation or plant used for telecommunications'' includes all buildings, lands, structures, machinery, equipment, cables, poles and lines used or intended for use in connection with telecommunications; ''letter'' includes any communication in the nature of current and personal correspondence and includes postcard; ''licence'' means licence issued under the provisions of this Act; "licensee'' means any person licensed under the provisions of this Act; ''mail bag'' means any bag, container, envelope or covering in which postal articles are conveyed; "message'' means any sign, signal, writing, image, sound, intelligence or information of any nature transmitted by telecommunications; ''Minister'' means Minister for the time being responsible for communi''parcel'' means a postal article which is posted at a post office as a parcel or is received at a post office by parcel post; "post'' means any system for the collection, dispatch, conveyance, handling and delivery of postal articles by or through a public postal licensee; "post office'' means any building, house, room, vehicle or place where postal articles are received, delivered, sorted, made up or dispatched; "postage'' means the fee chargeable for the transmission by post of postal articles; "postage stamp'' means any label or stamp for denoting any postage or other sum payable in respect of a postal article, and including any adhesive postage stamp or stamp printed, impressed or otherwise indicated on a postal article, whether the postage stamp is issued under this Act or by the government of any other country; " postal article'' means any article or thing transmissible by post but does not include such article or thing as the Minister may prescribe to be not transmissible by post; " postal service'' means any service by post; "postal successor corporation'' means the Tanzania Posts Corporation. established by the Tanzania Posts Corporation Act, 1993;