Industrial Property Regulations, 2002 the application and shall be the terms, signs and symbols generally accepted in the relevant field. (20) If anything is expressed in units other than metric units the equivalent in metric units shall also be given. Provisional specification. 18. (1) In this Regulation, “specification” means the description, claims, drawings and abstract. (2) An application may be filed with a provisional specification. (3) The following apply if an application is filed with a provisional specification — (a) unless the applicant files a final specification within one year after the application is filed, the application shall be deemed to have been withdrawn; (b) the Managing Director shall take no steps with respect to the application until the final specification is filed, except under section 41(1) to (3) of the Act; (c) the final specification shall be filed using Form IP 3; (d) the final specification shall not go beyond the disclosure in the provisional specification; and (e) the filing of the final specification shall not affect the filing date accorded under section 41 of the Act. Unity of invention. 19. (1) For the purposes of section 35 of the Act, a group of inventions forms a single general inventive concept if there exists between or among those inventions a technical relationship that involves one or more of the same or corresponding special technical features. (2) In paragraph (1), “special technical features” 13