To verify a trade company in Tongling, a process similar to that in most cities follows these steps:

1. **Official Registration**: The first step is to check if the company has registered at Tongling’s local administrative bureau (such as the Department of Industry and Information). They should have an official business registration number.

2. **Verify Registration Document**: Next, obtain a copy of the company’s registration document. This will typically be a certificate issued by the relevant authority.

3. **Check Company Records**: You can also verify the trade company’s information by checking their records at Tongling’s local tax office, chamber of commerce, or other related agencies.

Remember that the process might vary depending on the specific requirements and regulations in Tongling.