Site: nolo.com
... A coordinated class is one that's related to another class, usually because the USPTO has determined ... that applicants filing within one particular class often file in other specific classes, too. ... shirts (Class 25), you must pay the filing fee for two classes, which is double the filing fee for one ... For every class of goods or services, you'll need to submit at least one specimen regardless of how many ... So, if you apply for hats, t-shirts, and socks under Class 25, then you'll only need to submit one specimen ...