2N2256, 2N2257 (SILICON) 2N2258 {GERMANIUM} 2N2259.
Motorola
2N2258 - NPN silicon and PNP germanium mesa complementary transistors
2N2256, 2N2257 (SILICON) 2N2258 {GERMANIUM} 2N2259 (GERMANIUM) CASE 22 (TO-18) Collector connected to cese NPN silicon and PNP germanium mesa comple.