By March 1953, the company was producing 10,000 transistors a month which sold for $9 each, and every last one of them went into hearing aids.
The company never managed to get into any other market.
By 1955 it had dropped out of the ranks of top ten transistor manufacturers.
By 1957, it still had 80% of the market for transistors for hearing aids but had fallen well behind the leaders in total transistor volumes going into multiple other applications.
Moral: Pervasiveness is the life-blood of the semiconductor industry.