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Boring-tool

Two technical line drawings show a long cylindrical pattern-and-music cylinder assembly in cross-section (Fig. 1) with labeled holes and a boring tool, and a circular end-view cross-section (Fig. 2) revealing the nested pattern cylinder and inner music cylinder with aligned holes.

IMPROVEMENT IN THE MANUFACTURE OF MUSIC-BOX CYLINDERS.Arnold Frankfeld · October 28, 1873

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