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He along with the other names mentioned truly made a significant impact on how things would come to past. There where others working in those early days on junction transitor technologies, as well but they surely contributed in significant ways as how the new technology was advanced in a big way. Our research arm had the money available for sustainable research and development over the years due to the products/services we sold. Unlike a single or small group with equal talents confined to say a single University, AT&T pushed the limits on new semi-conductor technologies for a long time.
We had many first in this field. We used to chuckle say when IBM announced to the world it created a 16K RAM. Turns out they used four 4K RAMS. Ours fully developed and operational for two years before theirs was a real 16K RAM. Same was true with all the proceeding jumps in RAM/ROM technologies as one example as well as the MOS channel size shrinking.
The world would hear about some company advancing a technology never understanding Bell Labs had already done it for internal system usuage.