SE has a tongue (P) comprising a metal junction (10) having one end pivotally connected with the sliding body (30); A tab body (29) made of such as ivory, tortoiseshell, ETC, WHOSE at one end a cutting substantially identical WITH END OF THE UNION (10) NATURAL PRODUCTS; And means (14, 21, 16) TO CONNECT THE OTHER END OF THE UNION (10) and one end of end of the body of the tongue (20). VARIOUS MATERIALS ARE AVAILABLE FOR THE BODY OF TONGUE (20) to satisfy the tastes of any consumer
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