No crossover. According to the trademark classification query, it can be seen that the Class 7 trademark filter does not overlap with the Class 12 trademark. The filter in the Class 7 trademark is an engine filter, while the Class 12 trademark does not include the motor or engine parts of the Class 7 trademark. Trademark classification refers to trademarks consisting only of words, including Chinese characters and ethnic minority characters, foreign characters and Arabic numerals, or trademarks with various combinations of different characters. It is also the basic unit for applying for trademark registration procedures and paying fees.