present perfect again

[Hanka]

Hello,

could you please explain the difference between the following sentences:

Other notable brands for which we worked
Other notable brands for which we have worked

Thank you very much

Hanka

[lhn]

Hello,
could you please explain the difference between the following sentences:
Other notable brands for which we worked
Other notable brands for which we have worked
Thank you very much
Hanka

First, I am not a native English speaker. But, I would like to answer your question.

1. Other notable brands for which we worked=Other notable brands which we worked for

2. Other notable brands for which we have worked=Other notable brands which we have worked for

Number 1 means that the action was in the past and doesn't go on anymore.
Number 2 means the action began in the past and goes on.

Hope this helps...