I am curious if fan-driven cooling and the automatic defrost system with timer and heater that we know today came about simultaneously. In other words, before that time, there was no traditional auto defrost, and no fan for cooling, but just an evaporator structure of some sort. Then the engineers came along and added a heater, then had to add a rear panel in order to protect food from the heater, then had to add the fan since the panel was in the way.
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