Patent #02460931, issued to William Gretsch February 8, 1949, for an ocarina.
Patent #02460931, issued to William Gretsch February 8, 1949, for an ocarina.
Patent #02460931, issued to William Gretsch February 8, 1949, for an ocarina.
Patent #02460931, issued to William Gretsch February 8, 1949, for an ocarina.