2N6257 semiconductor manufactured by Sylvania, listed as 2N6257 (circa 1979).

2N6254 semiconductor manufactured by Sylvania, listed as 2N6254 (circa 1979).

2N6253 semiconductor manufactured by Sylvania, listed as 2N6253 (circa 1979).

2N6247 semiconductor manufactured by Sylvania, listed as 2N6247 (circa 1979).

2N6246 semiconductor manufactured by Sylvania, listed as 2N6246 (circa 1979).

2N6241 semiconductor manufactured by Sylvania, listed as 2N6241 (circa 1979).

2N6240 semiconductor manufactured by Sylvania, listed as 2N6240 (circa 1979).

2N6239 semiconductor manufactured by Sylvania, listed as 2N6239 (circa 1979).

2N6238 semiconductor manufactured by Sylvania, listed as 2N6238 (circa 1979).

2N6237 semiconductor manufactured by Sylvania, listed as 2N6237 (circa 1979).

2N6236 semiconductor manufactured by Sylvania, listed as 2N6236 (circa 1979).

2N6231 semiconductor manufactured by Sylvania, listed as 2N6231 (circa 1979).

2N6229 semiconductor manufactured by Sylvania, listed as 2N6229 (circa 1979).

2N6228 semiconductor manufactured by Sylvania, listed as 2N6228 (circa 1979).

2N6227 semiconductor manufactured by Sylvania, listed as 2N6227 (circa 1979).

2N6226 semiconductor manufactured by Sylvania, listed as 2N6226 (circa 1979).

2N6214 semiconductor manufactured by Sylvania, listed as 2N6214 (circa 1979).

2N6213 semiconductor manufactured by Sylvania, listed as 2N6213 (circa 1979).

2N6211 semiconductor manufactured by Sylvania, listed as 2N6211 (circa 1979).

2N6200 semiconductor manufactured by Sylvania, listed as 2N6200 (circa 1979).