2N638 semiconductor manufactured by Sylvania, listed as 2N638 (circa 1979).

2N1348 semiconductor manufactured by Sylvania, listed as 2N1348 (circa 1979).

2N1205 semiconductor manufactured by Sylvania, listed as 2N1205 (circa 1979).

2N1115A semiconductor manufactured by Sylvania, listed as 2N1115A (circa 1979).

2N992 semiconductor manufactured by Sylvania, listed as 2N992 (circa 1979).

2N840 semiconductor manufactured by Sylvania, listed as 2N840 (circa 1979).

2N720A semiconductor manufactured by Sylvania, listed as 2N720A (circa 1979).

2N637B semiconductor manufactured by Sylvania, listed as 2N637B (circa 1979).

2N1347 semiconductor manufactured by Sylvania, listed as 2N1347 (circa 1979).

2N1204A semiconductor manufactured by Sylvania, listed as 2N1204A (circa 1979).

2N1115 semiconductor manufactured by Sylvania, listed as 2N1115 (circa 1979).

2N991 semiconductor manufactured by Sylvania, listed as 2N991 (circa 1979).

2N839 semiconductor manufactured by Sylvania, listed as 2N839 (circa 1979).

2N720 semiconductor manufactured by Sylvania, listed as 2N720 (circa 1979).

2N637A semiconductor manufactured by Sylvania, listed as 2N637A (circa 1979).

2N1346 semiconductor manufactured by Sylvania, listed as 2N1346 (circa 1979).

2N1204 semiconductor manufactured by Sylvania, listed as 2N1204 (circa 1979).

2N1114 semiconductor manufactured by Sylvania, listed as 2N1114 (circa 1979).

2N990 semiconductor manufactured by Sylvania, listed as 2N990 (circa 1979).

2N838 semiconductor manufactured by Sylvania, listed as 2N838 (circa 1979).