2N3291 semiconductor manufactured by Sylvania, listed as 2N3291 (circa 1979).

2N3290 semiconductor manufactured by Sylvania, listed as 2N3290 (circa 1979).

2N3289 semiconductor manufactured by Sylvania, listed as 2N3289 (circa 1979).

2N3288 semiconductor manufactured by Sylvania, listed as 2N3288 (circa 1979).

2N3287 semiconductor manufactured by Sylvania, listed as 2N3287 (circa 1979).

2N3286 semiconductor manufactured by Sylvania, listed as 2N3286 (circa 1979).

2N3285 semiconductor manufactured by Sylvania, listed as 2N3285 (circa 1979).

2N3284 semiconductor manufactured by Sylvania, listed as 2N3284 (circa 1979).

2N3283 semiconductor manufactured by Sylvania, listed as 2N3283 (circa 1979).

2N3282 semiconductor manufactured by Sylvania, listed as 2N3282 (circa 1979).

2N3281 semiconductor manufactured by Sylvania, listed as 2N3281 (circa 1979).

2N3280 semiconductor manufactured by Sylvania, listed as 2N3280 (circa 1979).

2N3279 semiconductor manufactured by Sylvania, listed as 2N3279 (circa 1979).

2N3268 semiconductor manufactured by Sylvania, listed as 2N3268 (circa 1979).

2N3267 semiconductor manufactured by Sylvania, listed as 2N3267 (circa 1979).

2N3262 semiconductor manufactured by Sylvania, listed as 2N3262 (circa 1979).

2N3261 semiconductor manufactured by Sylvania, listed as 2N3261 (circa 1979).

2N3259 semiconductor manufactured by Sylvania, listed as 2N3259 (circa 1979).

2N3251A semiconductor manufactured by Sylvania, listed as 2N3251A (circa 1979).

2N3251 semiconductor manufactured by Sylvania, listed as 2N3251 (circa 1979).