| http://www.w3.org/ns/prov#value | - Boards of like width are glued and tongue- jointed to a length of twenty-two feet, which is roughly the measure of the piano's perimeter from the bass side around to the treble. (There is no left and right in a piano factory, only bass and treble.) Typically a book of boards--one rim's worth--consists of nine narrow maple boards, five wider ones, and four layers of other types added for strength
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