system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do companies like Delta, the airline company, and Delta, the faucet company, not run into any trademark and/or brand issues since they both have the same name?
gpt
There are 45 classes of trademarks, including goods like:

* Class 10  Medical, Dental Instruments and Apparatus
* Class 11  Appliances, Lighting, Heating, Sanitary Installations
* Class 12  Vehicles

and services like

* Class 36  Insurance, Financial
* Class 37  Construction, Repair, Cleaning

When you register a trademark, it's only within a certain class, or sometimes within 2 or 3 classes.

Someone can have the same name for a business as long as it's in a different class.