2N2293 semiconductor manufactured by Sylvania, listed as 2N2293 (circa 1979).

2N2292 semiconductor manufactured by Sylvania, listed as 2N2292 (circa 1979).

2N2291 semiconductor manufactured by Sylvania, listed as 2N2291 (circa 1979).

2N2290 semiconductor manufactured by Sylvania, listed as 2N2290 (circa 1979).

2N2289 semiconductor manufactured by Sylvania, listed as 2N2289 (circa 1979).

2N2288 semiconductor manufactured by Sylvania, listed as 2N2288 (circa 1979).

2N2287 semiconductor manufactured by Sylvania, listed as 2N2287 (circa 1979).

2N2286 semiconductor manufactured by Sylvania, listed as 2N2286 (circa 1979).

2N2285 semiconductor manufactured by Sylvania, listed as 2N2285 (circa 1979).

2N2282 semiconductor manufactured by Sylvania, listed as 2N2282 (circa 1979).

2N2281 semiconductor manufactured by Sylvania, listed as 2N2281 (circa 1979).

2N2280 semiconductor manufactured by Sylvania, listed as 2N2280 (circa 1979).

2N2279 semiconductor manufactured by Sylvania, listed as 2N2279 (circa 1979).

2N2278 semiconductor manufactured by Sylvania, listed as 2N2278 (circa 1979).

2N2277 semiconductor manufactured by Sylvania, listed as 2N2277 (circa 1979).

2N2276 semiconductor manufactured by Sylvania, listed as 2N2276 (circa 1979).

2N2275 semiconductor manufactured by Sylvania, listed as 2N2275 (circa 1979).

2N2274 semiconductor manufactured by Sylvania, listed as 2N2274 (circa 1979).

2N2273 semiconductor manufactured by Sylvania, listed as 2N2273 (circa 1979).

2N2272 semiconductor manufactured by Sylvania, listed as 2N2272 (circa 1979).