Step 1: Go to the American trademark inquiry website, select the second option, select the structured inquiry, and click Enter.

Step 2: Enter the trademark to be queried in the "search word" column, select BasicIndex in the query column, then enter the international classification number in the "search word" column, such as 009 (3 digits are required), select InternationalClass in the query column, and associate the two conditions with "AND".

If you want to query two keywords with spaces in the same category, you can use "and" to associate the two keywords, such as "b" and "helmet".

Step 3: Click "SubmitQuery" to submit the query and get the search results.

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