2N5623 semiconductor manufactured by Sylvania, listed as 2N5623 (circa 1979).

2N5622 semiconductor manufactured by Sylvania, listed as 2N5622 (circa 1979).

2N5621 semiconductor manufactured by Sylvania, listed as 2N5621 (circa 1979).

2N5620 semiconductor manufactured by Sylvania, listed as 2N5620 (circa 1979).

2N5618 semiconductor manufactured by Sylvania, listed as 2N5618 (circa 1979).

2N5616 semiconductor manufactured by Sylvania, listed as 2N5616 (circa 1979).

2N5614 semiconductor manufactured by Sylvania, listed as 2N5614 (circa 1979).

2N5604 semiconductor manufactured by Sylvania, listed as 2N5604 (circa 1979).

2N5602 semiconductor manufactured by Sylvania, listed as 2N5602 (circa 1979).

2N5600 semiconductor manufactured by Sylvania, listed as 2N5600 (circa 1979).

2N5598 semiconductor manufactured by Sylvania, listed as 2N5598 (circa 1979).

2N5591 semiconductor manufactured by Sylvania, listed as 2N5591 (circa 1979).

2N5590 semiconductor manufactured by Sylvania, listed as 2N5590 (circa 1979).

2N5589 semiconductor manufactured by Sylvania, listed as 2N5589 (circa 1979).

2N5574 semiconductor manufactured by Sylvania, listed as 2N5574 (circa 1979).

2N5573 semiconductor manufactured by Sylvania, listed as 2N5573 (circa 1979).

2N5570 semiconductor manufactured by Sylvania, listed as 2N5570 (circa 1979).

2N5569 semiconductor manufactured by Sylvania, listed as 2N5569 (circa 1979).

2N5555 semiconductor manufactured by Sylvania, listed as 2N5555 (circa 1979).

2N5551 semiconductor manufactured by Sylvania, listed as 2N5551 (circa 1979).