Section 133 of the Indian Patents Act 1970
Section 133 of the Indian Patents Act 1970 is about Convention countries. It is under CHAPTER XXII of the Act. CHAPTER XXII is titled INTERNATIONAL ARRANGEMENTS.
Convention countries
Any country, which is a signatory or party or a group of countries, union of countries or inter-governmental organisations which are signatories or parties to an international, regional or bi-lateral treaty, convention or arrangement to which India is also a signatory or party and which affords to the applicants for patents in India or to citizens of India similar privileges as are granted to their own citizens or citizens to their member countries in respect of the grant of patents and protection of patent rights shall be a convention country or convention countries for the purposes of this Act.
See also:
Section 132 Indian Patents Act 1970 (Savings in respect of other persons authorised to act as agents.)