2N2193A semiconductor manufactured by Sylvania, listed as 2N2193A (circa 1979).

2N2193 semiconductor manufactured by Sylvania, listed as 2N2193 (circa 1979).

2N2192B semiconductor manufactured by Sylvania, listed as 2N2192B (circa 1979).

2N2192A semiconductor manufactured by Sylvania, listed as 2N2192A (circa 1979).

2N2192 semiconductor manufactured by Sylvania, listed as 2N2192 (circa 1979).

2N2191 semiconductor manufactured by Sylvania, listed as 2N2191 (circa 1979).

2N2190 semiconductor manufactured by Sylvania, listed as 2N2190 (circa 1979).

2N2189 semiconductor manufactured by Sylvania, listed as 2N2189 (circa 1979).

2N2188 semiconductor manufactured by Sylvania, listed as 2N2188 (circa 1979).

2N2187 semiconductor manufactured by Sylvania, listed as 2N2187 (circa 1979).

2N2186 semiconductor manufactured by Sylvania, listed as 2N2186 (circa 1979).

2N2185 semiconductor manufactured by Sylvania, listed as 2N2185 (circa 1979).

2N2184 semiconductor manufactured by Sylvania, listed as 2N2184 (circa 1979).

2N2183 semiconductor manufactured by Sylvania, listed as 2N2183 (circa 1979).

2N2182 semiconductor manufactured by Sylvania, listed as 2N2182 (circa 1979).

2N2181 semiconductor manufactured by Sylvania, listed as 2N2181 (circa 1979).

2N2180 semiconductor manufactured by Sylvania, listed as 2N2180 (circa 1979).

2N2178 semiconductor manufactured by Sylvania, listed as 2N2178 (circa 1979).

2N2177 semiconductor manufactured by Sylvania, listed as 2N2177 (circa 1979).

2N2176 semiconductor manufactured by Sylvania, listed as 2N2176 (circa 1979).