Assertion: piano's mechanism | /r/HasProperty | 163.7 mm
Facets:
Source sentences:
text: However, if a basic unit of 0.036 French inch is used, leading to the white keys being spaced on intervals of 0.864 French inches, the mechanisms of the notes being spaced at intervals of 0.504 French inches, and the width of an octave being 6.048 French inches, this span would be 6.446 inches or 163.7 mm.