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250 kilograms is about three-fifths as heavy as a Grand Piano
In other words, it's 0.56 times the weight of a Grand Piano, and the weight of a Grand Piano is 1.8 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 kg. Well-made pianos such as this may last 75 to 100 years.
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