NEW YORK — In the final results of an anti-dumping duty administrative review of imports of diamond sawblades from China from Jan. 23, 2009, to Oct. 31, 2010, the Commerce Department’s International Trade Administration (ITA) has ruled that the 32 companies covered by the review sold merchandise at less than normal value and has assigned weighted-average margins of 0.15 to 9.55 percent. The Chinawide rate is 164.09 percent.