You misunderstood what I was saying.
Ten years or so ago a number of technologist were saying that we were reaching the limit of what can be done with the geometry of a transistor in an integrated circuit. That heat, lithography, materials and other issues would prevent further integration. Except that it didn’t...
1972 was the first HP pocket calculator. A little short of 48 years, but close enough...
72 was the HP45, and 65 and 73 was the 55.