Dr. Valentin Gapontsev and IPG Settle Litigation with US Treasury over Congressional ReportGlobeNewsWire • 09/11/19
IPG Photonics Corp, Inc. (IPGP) CEO Valentin Gapontsev on Q2 2019 Results - Earnings Call TranscriptSeeking Alpha • 07/30/19
IPG Photonics Corp, Inc. (IPGP) CEO Valentin Gapontsev on Q1 2019 Results - Earnings Call TranscriptSeeking Alpha • 04/30/19