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The other quite common type of cast iron opener that you see has the numbers RD. 811274 on one side and PT. 466444,
Abstract of GB 466444 (A)466,444. Removing crown - corks. WILLETTS, C. T. May 12, 1936, No. 13389. [Class 125 (ii)] A flat prizing tool a, for removing crown-corks is formed oppositely to the prizing tongue d with one or more gripping teeth h, Fig. 4, f, g, Fig. 1, of the full thickness of the plate. The elongated hole e is of such size that the teeth impose a central pressure on the cap and the sides e<2>, e3 are lifted clear of the closure when in use.