0000950135-06-007409 424B4 6 20061213 20061213 IPG PHOTONICS CORP 0001111928 3674 043444218 DE 424B4 33 333-136521 061274107 50 OLD WEBSTER ROAD OXFORD MA 01540 5083731100 50 OLD WEBSTER ROAD OXFORD MA 01540 424B4 1 b61608b4e424b4.htm IPG PHOTONICS CORPORATION GRAPHIC 2 b61608b4b6160800.gif GRAPHIC GRAPHIC 3 b61608b4b6160802.jpg GRAPHIC GRAPHIC 4 b61608b4b6160804.gif GRAPHIC GRAPHIC 5 b61608b4b6160805.gif GRAPHIC GRAPHIC 6 b61608b4b6160801.jpg GRAPHIC