2N4299 semiconductor manufactured by Sylvania, listed as 2N4299 (circa 1979).

2N4298 semiconductor manufactured by Sylvania, listed as 2N4298 (circa 1979).

2N4297 semiconductor manufactured by Sylvania, listed as 2N4297 (circa 1979).

2N4296 semiconductor manufactured by Sylvania, listed as 2N4296 (circa 1979).

2N4291 semiconductor manufactured by Sylvania, listed as 2N4291 (circa 1979).

2N4290 semiconductor manufactured by Sylvania, listed as 2N4290 (circa 1979).

2N4288 semiconductor manufactured by Sylvania, listed as 2N4288 (circa 1979).

2N4287 semiconductor manufactured by Sylvania, listed as 2N4287 (circa 1979).

2N4286 semiconductor manufactured by Sylvania, listed as 2N4286 (circa 1979).

2N4275 semiconductor manufactured by Sylvania, listed as 2N4275 (circa 1979).

2N4274 semiconductor manufactured by Sylvania, listed as 2N4274 (circa 1979).

2N4270 semiconductor manufactured by Sylvania, listed as 2N4270 (circa 1979).

2N4269 semiconductor manufactured by Sylvania, listed as 2N4269 (circa 1979).

2N4267 semiconductor manufactured by Sylvania, listed as 2N4267 (circa 1979).

2N4259 semiconductor manufactured by Sylvania, listed as 2N4259 (circa 1979).

2N4258A semiconductor manufactured by Sylvania, listed as 2N4258A (circa 1979).

2N4257A semiconductor manufactured by Sylvania, listed as 2N4257A (circa 1979).

2N4257 semiconductor manufactured by Sylvania, listed as 2N4257 (circa 1979).

2N4256 semiconductor manufactured by Sylvania, listed as 2N4256 (circa 1979).

2N4255 semiconductor manufactured by Sylvania, listed as 2N4255 (circa 1979).