Assertion: piano's mechanism | /r/HasProperty | spaced on 0.5383 inch centers
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Source sentences:
text: Thus, if we go with a fundamenal unit of 0.03845 inch, then the white keys are spaced on 0.9228 inch intervals, the internal mechanisms of the instrument are spaced on 0.5383 inch centers, and the width of an octave is 6.4596 inches.