the whole of the national territory of the Republic, subject to paragraph (b). (b) (6) 6. Once such a notification has been made such patent right shall continue to apply only to the geographical areas of Bophuthatswana, Transkei or Venda, as the case may be, for as long as and to the extent that a valid registered patent for the same invention subsists in terms of the South African Act, but, subject to paragraph (a), such patent right shall extend to the whole of the national territory if and when such right in terms of the South African Act does not exist. Any lawful use by any person of an invention commenced prior to 27 April 1994 in the geographical area of Bophuthatswana, Transkei or Venda shall not become unlawful by virtue of this Act, provided that use is not extended outside the geographical area concerned. Patent Registers and Records The Registers of Patents and records shall be transferred to and kept in the office of the Registrar of Patents. 7. Identification of patents All patents registered and all patent applications filed in terms of the Bophuthatswana Act, Transkei Act and Venda Act shall be identified by the suffixes '(BT)', '(TR)' and '(VE)', respectively. PART 4 REGISTERED DESIGNS (ss 8-10) 8. Application of South African Designs Act (1) Subject to the provisions of this section, the South African Act shall apply to designs registered or deemed to be registered under the Bophuthatswana Act, the Transkei Act or the Venda Act. (2) Subject to subsection (5), the validity of a design registration entered on the Register of Designs and the duration of such a design registration shall be determined in accordance with the laws applying to the application for registration of that design as at the date of that application. (3) Subject to subsection (5), the repeal of the laws by section 16 does not affect any proceedings or applications commenced under the Bophuthatswana Act, the Transkei Act or the Venda Act, and any such proceedings or applications shall be continued with and concluded as if the laws had not been repealed, provided that(a) the Registrar of Designs shall perform the functions and duties of the registrars appointed under those Acts; and