Hello,
I want to introduce one of my company specialist to another company. My specialist should repair some equipments in the other company.
Thanks a million...

Hi, Mehdi Ghadiri!

Are you wanting to write some kind of letter? I'm not clear from what you've written as to exactly what you're wanting to do.

Thanks!

Hi,
Yes, exactly. I want to write a Letter.
Thanks.

Hi again, Mehdi Ghadiri!

You know more about your business than anyone else here. So, what I would suggest doing, is to put together a draft letter here, without putting in any contact information.

Then, I'm sure that others will be willing to take a look at what you've written and suggest ways that you might make improvements to it.

Thanks!