2N2645 semiconductor manufactured by Sylvania, listed as 2N2645 (circa 1979).

2N2638 semiconductor manufactured by Sylvania, listed as 2N2638 (circa 1979).

2N2637 semiconductor manufactured by Sylvania, listed as 2N2637 (circa 1979).

2N2636 semiconductor manufactured by Sylvania, listed as 2N2636 (circa 1979).

2N2635 semiconductor manufactured by Sylvania, listed as 2N2635 (circa 1979).

2N2631 semiconductor manufactured by Sylvania, listed as 2N2631 (circa 1979).

2N2630 semiconductor manufactured by Sylvania, listed as 2N2630 (circa 1979).

2N2629 semiconductor manufactured by Sylvania, listed as 2N2629 (circa 1979).

2N2628 semiconductor manufactured by Sylvania, listed as 2N2628 (circa 1979).

2N2627 semiconductor manufactured by Sylvania, listed as 2N2627 (circa 1979).

2N2626 semiconductor manufactured by Sylvania, listed as 2N2626 (circa 1979).

2N2625 semiconductor manufactured by Sylvania, listed as 2N2625 (circa 1979).

2N2624 semiconductor manufactured by Sylvania, listed as 2N2624 (circa 1979).

2N2623 semiconductor manufactured by Sylvania, listed as 2N2623 (circa 1979).

2N2622 semiconductor manufactured by Sylvania, listed as 2N2622 (circa 1979).

2N2621 semiconductor manufactured by Sylvania, listed as 2N2621 (circa 1979).

2N2619 semiconductor manufactured by Sylvania, listed as 2N2619 (circa 1979).

2N2618 semiconductor manufactured by Sylvania, listed as 2N2618 (circa 1979).

2N2617 semiconductor manufactured by Sylvania, listed as 2N2617 (circa 1979).

2N2616 semiconductor manufactured by Sylvania, listed as 2N2616 (circa 1979).