ANSWERS: 3
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microwave "oven", or invisible micro'wave' itself?
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I don't know about modern times, but around the turn of the century (plus or minus a few years) when the microwave oven first came out, military microwaves were the size of refridgerators.
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Arguably that would be the radiotelescope dish at the Arecibo Observatory - Arecibo, Puerto Rico. 1,000 feet in diameter with a 126 foot dip in it and covering 20 acres.
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