Harry Truman actually said...
And provided further, that the provision of section 1(e) of the said title 17, so far as they secure copyright controlling parts of instruments serving to reproduce mechanically the musical work, shall apply only to compositions published on or after third day, and registered for copyright in the United States which have not been reproduced within the United States prior to this day on any contrivance by means of which the work may be mechanically performed.
10/14/1952