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Usage for serration
... 2011, a Finance Ministry statement said. The statement said the issuance of coin is aimed at expressing solidarity, unity and perpetual friendship with China. The coin will be round with serration on the edge and a diameter of 30 mm weighing 9.5 grams.
“Some spatulas have a little serration on the side, so you can come across your meat on the side to get the meat off the grill. Some spatulas are thinner at the top. You might want a different spatula for fish than you would for your burgers. ...