0001111928-09-000110 4 1 20091118 20091119 20091119 Lopresti Angelo P 0001378548 4 34 001-33155 091196050 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