2N4147 semiconductor manufactured by Sylvania, listed as 2N4147 (circa 1979).

2N4146 semiconductor manufactured by Sylvania, listed as 2N4146 (circa 1979).

2N4145 semiconductor manufactured by Sylvania, listed as 2N4145 (circa 1979).

2N4144 semiconductor manufactured by Sylvania, listed as 2N4144 (circa 1979).

2N4142 semiconductor manufactured by Sylvania, listed as 2N4142 (circa 1979).

2N4141 semiconductor manufactured by Sylvania, listed as 2N4141 (circa 1979).

2N4135 semiconductor manufactured by Sylvania, listed as 2N4135 (circa 1979).

2N4134 semiconductor manufactured by Sylvania, listed as 2N4134 (circa 1979).

2N4128 semiconductor manufactured by Sylvania, listed as 2N4128 (circa 1979).

2N4127 semiconductor manufactured by Sylvania, listed as 2N4127 (circa 1979).

2N4126 semiconductor manufactured by Sylvania, listed as 2N4126 (circa 1979).

2N4125 semiconductor manufactured by Sylvania, listed as 2N4125 (circa 1979).

2N4124 semiconductor manufactured by Sylvania, listed as 2N4124 (circa 1979).

2N4123 semiconductor manufactured by Sylvania, listed as 2N4123 (circa 1979).

2N4121 semiconductor manufactured by Sylvania, listed as 2N4121 (circa 1979).

2N4120 semiconductor manufactured by Sylvania, listed as 2N4120 (circa 1979).

2N4119A semiconductor manufactured by Sylvania, listed as 2N4119A (circa 1979).

2N4119 semiconductor manufactured by Sylvania, listed as 2N4119 (circa 1979).

2N4118 semiconductor manufactured by Sylvania, listed as 2N4118 (circa 1979).

2N4117A semiconductor manufactured by Sylvania, listed as 2N4117A (circa 1979).