The realization that electrical engineering is a part of physics and not a separate discipline.
New possibilities to calculate Maxwell, through numerical methods, faster computers, better models
Materials knowledge
Materials management that makes thermal phenomena and mechanical forces more controllable and predictable.
Developments in the field of measurement and control technology
Availability of hardware and software, control computers, sensors, actuators, etc.
The fundamental insight that in a number of cases geometry does indeed play a role in the behavior of a system; where this insight existed only occasionally it was often experienced as a parasitic or undesirable phenomenon
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