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645.5 miligrams is about one-seven-hundred-thousandth as as a Grand Piano.
In other words, it's 0.0000014 times the of a Grand Piano, and the of a Grand Piano is 710,000 times that amount.
(for Steinway & Sons, Model D Concert Grand Piano)
A Grand Piano, of the kind used for concert performances in large music halls, weighs 450,000,000 miligrams. Well-made pianos such as this may last 75 to 100 years.
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