To verify a trade company in Tonghua, a process similar to that of verifying businesses online occurs. Here’s a step-by-step guide:

1. **Check Official Sources**: The first step is to visit the official website or bureau of Trade and Industry (T&I) in Tonghua. They usually have a list of registered companies.

2. **Verify Business License**: Every registered trade company should possess a valid business license issued by Tonghua’s T&I. You can check this document online.

3. **Check Company Registration Details**: Visit the online registration system maintained by the T&I. Input the company name or registration number to access their details.

4. **Verify Company Reputation**: While official verification is crucial, checking reviews and ratings from previous customers or industry partners can also provide valuable insights.

Remember that the process may vary slightly depending on the specific regulations in Tonghua.