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420 kilograms is about nine-tenths as heavy as a Grand Piano
In other words, it's 0.930 times the weight of a Grand Piano, and the weight of a Grand Piano is 1.10 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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