2N1965 semiconductor manufactured by Sylvania, listed as 2N1965 (circa 1979).

2N1964 semiconductor manufactured by Sylvania, listed as 2N1964 (circa 1979).

2N1963 semiconductor manufactured by Sylvania, listed as 2N1963 (circa 1979).

2N1962 semiconductor manufactured by Sylvania, listed as 2N1962 (circa 1979).

2N1961 semiconductor manufactured by Sylvania, listed as 2N1961 (circa 1979).

2N1960 semiconductor manufactured by Sylvania, listed as 2N1960 (circa 1979).

2N1959 semiconductor manufactured by Sylvania, listed as 2N1959 (circa 1979).

2N1958 semiconductor manufactured by Sylvania, listed as 2N1958 (circa 1979).

2N1957 semiconductor manufactured by Sylvania, listed as 2N1957 (circa 1979).

2N1956 semiconductor manufactured by Sylvania, listed as 2N1956 (circa 1979).

2N1955 semiconductor manufactured by Sylvania, listed as 2N1955 (circa 1979).

2N1954 semiconductor manufactured by Sylvania, listed as 2N1954 (circa 1979).

2N1953 semiconductor manufactured by Sylvania, listed as 2N1953 (circa 1979).

2N1952 semiconductor manufactured by Sylvania, listed as 2N1952 (circa 1979).

2N1951 semiconductor manufactured by Sylvania, listed as 2N1951 (circa 1979).

2N1950 semiconductor manufactured by Sylvania, listed as 2N1950 (circa 1979).

2N1949 semiconductor manufactured by Sylvania, listed as 2N1949 (circa 1979).

2N1948 semiconductor manufactured by Sylvania, listed as 2N1948 (circa 1979).

2N1947 semiconductor manufactured by Sylvania, listed as 2N1947 (circa 1979).

2N1946 semiconductor manufactured by Sylvania, listed as 2N1946 (circa 1979).