| 摘要 |
<p>DEVICES FOR SELECTIVE DISPLAY OF INFORMATION A musical information display device includes first and second relatively rotatable members, the first member bearing spaced musical indicia and the second member including apertures registrable with the first member indicia on such rotation and aperture-closing elements, each operable independently of the condition of closure of the remainder of such elements. The musical indicia are arranged in such progression as the chromatic scale and numeric identifiers are associated with the apertureclosing elements and are arranged in sequential order to be displayed selectively on operation of the aperture-closing elements.</p> |
