Obsolete Notices Feb. 2, 1987 - Groove Measurement March 11, 1987 - Groove Measurement July 1, 1987 - Rule Changes Nov. 25, 1987 - Surface Roughness March 15, 1989 - Symmetry Rule June 10, 1991 - Rule Changes for 1992 Oct. 23, 1995 - Rule Changes for 1996 June 16, 2000 - Spring-Like Effect Conformance Determination Regarding Non-Submitted Loft Models Aug. 6, 2002 - Spring-Like Effect Feb. 24, 2003 - Technical Description of Pendulum Test June 30, 2004 - Proposed Publication of USGA Conforming Driver Head List Dec. 15, 2004 - Publication of a List of Conforming Driver Heads April 11, 2005 - Invitation to Make Prototype Golf Balls Dec. 4, 2008 - Groove Rule Implementation Details Aug. 4, 2009 - USGA GROOVESCAN – A HIGH PRECISION, LOW COST METHOD OF MEASURING GROOVES Nov. 30, 2015 - DMDs Nov. 16, 2018 - Notice to Pendulum Licensees Regarding Pendulum Test