2N6199 semiconductor manufactured by Sylvania, listed as 2N6199 (circa 1979).

2N6198 semiconductor manufactured by Sylvania, listed as 2N6198 (circa 1979).

2N6177 semiconductor manufactured by Sylvania, listed as 2N6177 (circa 1979).

2N6176 semiconductor manufactured by Sylvania, listed as 2N6176 (circa 1979).

2N6175 semiconductor manufactured by Sylvania, listed as 2N6175 (circa 1979).

2N6174 semiconductor manufactured by Sylvania, listed as 2N6174 (circa 1979).

2N6173 semiconductor manufactured by Sylvania, listed as 2N6173 (circa 1979).

2N6172 semiconductor manufactured by Sylvania, listed as 2N6172 (circa 1979).

2N6169 semiconductor manufactured by Sylvania, listed as 2N6169 (circa 1979).

2N6167 semiconductor manufactured by Sylvania, listed as 2N6167 (circa 1979).

2N6165 semiconductor manufactured by Sylvania, listed as 2N6165 (circa 1979).

2N6164 semiconductor manufactured by Sylvania, listed as 2N6164 (circa 1979).

2N6162 semiconductor manufactured by Sylvania, listed as 2N6162 (circa 1979).

2N6161 semiconductor manufactured by Sylvania, listed as 2N6161 (circa 1979).

2N6160 semiconductor manufactured by Sylvania, listed as 2N6160 (circa 1979).

2N6156 semiconductor manufactured by Sylvania, listed as 2N6156 (circa 1979).

2N6155 semiconductor manufactured by Sylvania, listed as 2N6155 (circa 1979).

2N6154 semiconductor manufactured by Sylvania, listed as 2N6154 (circa 1979).

2N6153 semiconductor manufactured by Sylvania, listed as 2N6153 (circa 1979).

2N6152 semiconductor manufactured by Sylvania, listed as 2N6152 (circa 1979).