Dear Mr./Ms.,
Owing to the large increase in the volume of our trade with this country we have decided to open a branch here, with Mr. Wang Li as manager. The new branch will open on 1st March and from that date all orders and inquiries should be sent to Mr. Wang Li at the above address, instead of to our London office.
We take this opportunity to express our thanks for your cooperation in the past. We hope the new arrangements will lead to even better results.
Yours faithfully,
John Smith
General Manager
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Establishment of ______.