Bluebulb Projects' The Measure of Things presents:
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The item is
The number of Keys on a Piano
And it has the following description
(Moden layout; A0 to C7)
Most modern keyboards have 88 keys, comprising seven octaves and an additional major third. A full-size, acoustic piano may have as many as 12,000 separate parts.
As well as following link:
http://www.worldcat.org/title/88-keys-the-making-of-a-steinway-piano/oclc/37221039

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