OCTAMONICALLY TUNED
ELECTRICALLY OPERATED PERCUSSION INSTRUMENTS-NAMELY, INSTRUMENTS UTILIZING TUBULAR BARS OR SOLID BARS OR RODS OPERATED BY ELECTROMAGNETICALLY ENERGIZED STRIKERS; AND ORGAN HARPS USING SOLID BARS THAT ARE OPERATED BY ELECTROMAGNETICALLY ENERGIZED STRIKERS
Expired · March 28, 1949 · 71576218 ·