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  1. Employer identification number | Internal Revenue Service

  2. How Does a Tax ID Differ From a Corporate Number?

  3. Get an employer identification number | Internal Revenue Service

  4. The Difference Between a Tax ID number and Corporate Number

  5. Valid EINs - Internal Revenue Service

  6. Tax ID and Corporate Numbers Explained - MSN

  7. Get federal and state tax ID numbers | U.S. Small Business ...