How to trace back a modify history of single file?

Hi all,

Our workflow on SVN is that, lets developers work on a branch. After
a brief testing or screening by senior developer, then merge the branch
to trunk by senior developer.

The problem is that it is hard to trace back which developers is involved
in particular file before and is involved in which branch.

How to check it out?

Thank you very much.

--
Best regards,
Diviner.
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