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Portable jewelry scales began to appear in the 1700s AD, but the designs were very similar to balances that had been in use as early as 4000 BC.
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How do you weigh a wet diaper?
That's why they invented the scale -ilovehorseyrides
Is the portable recycling unit invented?
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What country invented portable video cameras?
The country that invented portable video cameras is....America
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1956
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