74LS161B semiconductor manufactured by Sylvania, listed as 74LS161B (circa 1979).

74LS161 semiconductor manufactured by Sylvania, listed as 74LS161 (circa 1979).

74LS157B semiconductor manufactured by Sylvania, listed as 74LS157B (circa 1979).

74LS153B semiconductor manufactured by Sylvania, listed as 74LS153B (circa 1979).

74LS151B semiconductor manufactured by Sylvania, listed as 74LS151B (circa 1979).

74LS138B semiconductor manufactured by Sylvania, listed as 74LS138B (circa 1979).

74LS136A semiconductor manufactured by Sylvania, listed as 74LS136A (circa 1979).

74A03 semiconductor manufactured by Sylvania, listed as 74A03 (circa 1979).

74A02 semiconductor manufactured by Sylvania, listed as 74A02 (circa 1979).

74LS123 semiconductor manufactured by Sylvania, listed as 74LS123 (circa 1979).

74A01 semiconductor manufactured by Sylvania, listed as 74A01 (circa 1979).

74LS109B semiconductor manufactured by Sylvania, listed as 74LS109B (circa 1979).

744238 semiconductor manufactured by Sylvania, listed as 744238 (circa 1979).

746831 semiconductor manufactured by Sylvania, listed as 746831 (circa 1979).

742970 semiconductor manufactured by Sylvania, listed as 742970 (circa 1979).

742698 semiconductor manufactured by Sylvania, listed as 742698 (circa 1979).

741752 semiconductor manufactured by Sylvania, listed as 741752 (circa 1979).

741724 semiconductor manufactured by Sylvania, listed as 741724 (circa 1979).

741656 semiconductor manufactured by Sylvania, listed as 741656 (circa 1979).

741280 semiconductor manufactured by Sylvania, listed as 741280 (circa 1979).