Harrington & Richardson Serialization

Harrington & Richardson Serialization 1940 to 1982
Year	Serial Number Prefix	Year	Serial Number Prefix	Year	Serial Number Prefix	Year	Serial Number Prefix
1940	A	1953	N	1966	AC	1979	AT
1941	B	1954	P	1967	AD	1980	AU
1942	C	1955	R	1968	AE	1981	AX
1943	D	1956	S	1969	AF	1982	AY
1944	E	1957	T	1970	AG	--	--
1945	F	1958	U	1971	AH*	--	--
1946	G	1959	V	1972	AJ	--	--
1947	H	1960	W	1973	AL	--	--
1948	I	1961	X	1974	AM	--	--
1949	J	1962	Y	1975	AN	--	--
1950	K	1963	Z	1976	AP	--	--
1951	L	1964	AA	1977	AR **	--	--
1952	M	1965	AB	1978	AS	--	--