2N3665 semiconductor manufactured by Sylvania, listed as 2N3665 (circa 1979).

2N3663 semiconductor manufactured by Sylvania, listed as 2N3663 (circa 1979).

2N3662 semiconductor manufactured by Sylvania, listed as 2N3662 (circa 1979).

2N3654 semiconductor manufactured by Sylvania, listed as 2N3654 (circa 1979).

2N3649 semiconductor manufactured by Sylvania, listed as 2N3649 (circa 1979).

2N3648 semiconductor manufactured by Sylvania, listed as 2N3648 (circa 1979).

2N3647 semiconductor manufactured by Sylvania, listed as 2N3647 (circa 1979).

2N3646 semiconductor manufactured by Sylvania, listed as 2N3646 (circa 1979).

2N3645 semiconductor manufactured by Sylvania, listed as 2N3645 (circa 1979).

2N3644 semiconductor manufactured by Sylvania, listed as 2N3644 (circa 1979).

2N3643 semiconductor manufactured by Sylvania, listed as 2N3643 (circa 1979).

2N3642 semiconductor manufactured by Sylvania, listed as 2N3642 (circa 1979).

2N3641 semiconductor manufactured by Sylvania, listed as 2N3641 (circa 1979).

2N3640 semiconductor manufactured by Sylvania, listed as 2N3640 (circa 1979).

2N3639 semiconductor manufactured by Sylvania, listed as 2N3639 (circa 1979).

2N3638A semiconductor manufactured by Sylvania, listed as 2N3638A (circa 1979).

2N3638 semiconductor manufactured by Sylvania, listed as 2N3638 (circa 1979).

2N3633 semiconductor manufactured by Sylvania, listed as 2N3633 (circa 1979).

2N3631 semiconductor manufactured by Sylvania, listed as 2N3631 (circa 1979).

2N3618 semiconductor manufactured by Sylvania, listed as 2N3618 (circa 1979).