Texas Instruments Germanium Grown Junction Transistor

TI introduced the 900 series silicon transistors in 1954 but they continued to produce germanium transistors. The germanium grown junction 2N172 was introduced in 1956, adding to their transistor portfolio for radios. TI and IDEA introduced the first all transistor radio (Regency TR-1) in 1954.
TI started transistor development in Lemmon Avenue in Dallas and in 1958 moved to a 300 acre site at North Central Expressway. The Semiconductor building was the first building on the campus. The building is still there (although modified) and is now a Raytheon building following the acquisition of TI's defense business in 1997. 

Working transistor, hfe=23, Vf=183mV, fairly low gain.

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