September 15, 1949	May 1, 1950	August 1, 1950	December 10, 1950
	August 15, 1951	April 1, 1952	August 15, 1952	January 1, 1954
	May 1, 1954	May 15, 1954	September 12, 1956	April 9, 1957
	November 17, 1957	November 10, 1958	December 9, 1959	November 1, 1960
	September 15, 1962	August 23, 1963	1970 Home	1976 Pro
	1977 Pro	1980 Pro	1970-1999 Home Speaker History and Price List