Ring for milling the rim of watch cases

Abstract

286,214. Drusenbaum, P. [Firm of]. Feb. 28, 1927, [Convention date]. Watches.-A former for use in knurling watch cases by spinning consists of an integral ring provided with the required pattern on its internal surface. The ring is split at a and slots c terminating in perforations b give added flexibility in springing the tool over the watch case. Pins on a plierlike tool may engage some of the holes for this purpose.

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