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Is there an official measurement in terms of key width for what can be described as full size keys? Or does it vary between pianos - if so are there rough rules?

marked as duplicate by Tetsujin, Mr. Boy, Chris, Shevliaskovic, Dom Dec 19 '14 at 12:11

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It varies between (upright) pianos and other keyboard instruments (which are mostly smaller) but is rather standardized for grand pianos.

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