0001111928-09-000116 4 1 20091204 20091207 20091207 Krupke William F 0001378552 4 34 001-33155 091226443 IPG PHOTONICS CORPORATION 50 OLD WEBSTER ROAD OXFORD MA 01540 IPG PHOTONICS CORP 0001111928 3674 043444218 DE 50 OLD WEBSTER ROAD OXFORD MA 01540 5083731100 50 OLD WEBSTER ROAD OXFORD MA 01540 4 1 edgar.xml PRIMARY DOCUMENT