sule 66Regulations under the PCT Rule 66 Procedure before the International Preliminary Examining Authority. 66.1 Basis of the International Preliminary Examination (a) Subject to paragraphsNotes (History of Amendments in Bare Text): 1. CGST Rule 66 introduced vide Notification 102017, effective 01072017.. 2. Amendments in sub-rule (2) from 28062019