Class 42 of trademark registration refers to the classification of trademarks related to scientific and technical services. The following are a few common subclasses in Class 42:

1. Scientific and technical research services: including scientific research, industrial research, medical research, agricultural research and so on.

2. Industrial analysis and research services: includes services for analyzing and researching industrial processes, products and materials.

3. Services for the design and development of computer hardware and software: including the design, development, customization and maintenance of computer hardware and software.

4. Services for the provision of scientific and technological information: including services for the provision of scientific and technological information, technological counseling, technological surveys and technological assessment.

5. Scientific and technological project management services: including services for the management, supervision and coordination of scientific and technological projects.

6. Technical Consultation and Research: includes services to provide consultation and research on technical and engineering issues.

Please note that the above are only some common subclasses in Class 42, and the actual trademark classification may be more detailed and specific. In the trademark registration application, depending on your specific business and services, you need to select the appropriate subclasses to ensure the accurate classification of your trademark.

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