| 摘要 |
A coin blank, particularly for minting of coins and the like, is formed by an external element (1) of metal or metal alloy having a central aperture, on the edge surface (4) of which are cut perimetrally a series of spaced grooves (5), and by an internal element (6), of metal or metal alloy different from the former, on the edge surface of which is formed a perimetral ridge (8,9), said external and internal elements being coupled inseparably during the minting operation through the plastic flow of the material from said perimetral ridge (8,9) into said grooves (5) in said external element (1) and through the firm fitting of the material from said ridge into the portions of the edge surface of said central aperture in said external element (6), provided between adjacent grooves (5). |
