0000950123-09-067429 8-K 2 20091109 8.01 9.01 20091202 20091202 IPG PHOTONICS CORP 0001111928 3674 043444218 DE 8-K 34 001-33155 091216122 50 OLD WEBSTER ROAD OXFORD MA 01540 5083731100 50 OLD WEBSTER ROAD OXFORD MA 01540 8-K 1 b78291e8vk.htm IPG PHOTONICS CORPORATION EX-4.1 2 b78291exv4w1.htm EX-4.1 FORM OF SENIOR INDENTURE, TO BE ENTERED INTO BETWEEN THE COMPANY AND TRUSTEE DESIGNATED THEREIN.