2N5188 semiconductor manufactured by Sylvania, listed as 2N5188 (circa 1979).

2N5187 semiconductor manufactured by Sylvania, listed as 2N5187 (circa 1979).

2N5186 semiconductor manufactured by Sylvania, listed as 2N5186 (circa 1979).

2N5184 semiconductor manufactured by Sylvania, listed as 2N5184 (circa 1979).

2N5183 semiconductor manufactured by Sylvania, listed as 2N5183 (circa 1979).

2N5182 semiconductor manufactured by Sylvania, listed as 2N5182 (circa 1979).

2N5181 semiconductor manufactured by Sylvania, listed as 2N5181 (circa 1979).

2N5180 semiconductor manufactured by Sylvania, listed as 2N5180 (circa 1979).

2N5179 semiconductor manufactured by Sylvania, listed as 2N5179 (circa 1979).

2N5176 semiconductor manufactured by Sylvania, listed as 2N5176 (circa 1979).

2N5175 semiconductor manufactured by Sylvania, listed as 2N5175 (circa 1979).

2N5174 semiconductor manufactured by Sylvania, listed as 2N5174 (circa 1979).

2N5172 semiconductor manufactured by Sylvania, listed as 2N5172 (circa 1979).

2N5171 semiconductor manufactured by Sylvania, listed as 2N5171 (circa 1979).

2N5169 semiconductor manufactured by Sylvania, listed as 2N5169 (circa 1979).

2N5168 semiconductor manufactured by Sylvania, listed as 2N5168 (circa 1979).

2N5167 semiconductor manufactured by Sylvania, listed as 2N5167 (circa 1979).

2N5166 semiconductor manufactured by Sylvania, listed as 2N5166 (circa 1979).

2N5165 semiconductor manufactured by Sylvania, listed as 2N5165 (circa 1979).

2N5164 semiconductor manufactured by Sylvania, listed as 2N5164 (circa 1979).