2N2247 semiconductor manufactured by Sylvania, listed as 2N2247 (circa 1979).

2N2246 semiconductor manufactured by Sylvania, listed as 2N2246 (circa 1979).

2N2245 semiconductor manufactured by Sylvania, listed as 2N2245 (circa 1979).

2N2244 semiconductor manufactured by Sylvania, listed as 2N2244 (circa 1979).

2N2242 semiconductor manufactured by Sylvania, listed as 2N2242 (circa 1979).

2N2241 semiconductor manufactured by Sylvania, listed as 2N2241 (circa 1979).

2N2240 semiconductor manufactured by Sylvania, listed as 2N2240 (circa 1979).

2N2238 semiconductor manufactured by Sylvania, listed as 2N2238 (circa 1979).

2N2237 semiconductor manufactured by Sylvania, listed as 2N2237 (circa 1979).

2N2236 semiconductor manufactured by Sylvania, listed as 2N2236 (circa 1979).

2N2235 semiconductor manufactured by Sylvania, listed as 2N2235 (circa 1979).

2N2234 semiconductor manufactured by Sylvania, listed as 2N2234 (circa 1979).

2N2225 semiconductor manufactured by Sylvania, listed as 2N2225 (circa 1979).

2N2222 semiconductor manufactured by Sylvania, listed as 2N2222 (circa 1979).

2N2221A semiconductor manufactured by Sylvania, listed as 2N2221A (circa 1979).

2N2221 semiconductor manufactured by Sylvania, listed as 2N2221 (circa 1979).

2N2219A semiconductor manufactured by Sylvania, listed as 2N2219A (circa 1979).

2N2218A semiconductor manufactured by Sylvania, listed as 2N2218A (circa 1979).

2N2218 semiconductor manufactured by Sylvania, listed as 2N2218 (circa 1979).

2N2217 semiconductor manufactured by Sylvania, listed as 2N2217 (circa 1979).