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I hate to burst some bubbles, but the type of testing mentioned in the RCA film is still done today by integrated circuit manufacturing firms. Chips are tested at the wafer level and after final assembly. They are also exposed to exteme temperatures, voltage, and humidity just as the RCA parts were. ICs are also tested for sensitivity to high voltage spikes.
People also still use the echo proof rooms. We had one at the IC design and manufacturing facility that I recently worked at. In addition, much better analysis instruments are available today than the ones RCA had in 1959.
The point is that quality manufacturing is still done today, just as RCA was doing in 1959.
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