Brief: Ngk Corp - To Buy Back Up To 2.3% Of Own Shares Worth 33 Billion Yen
April 30 (Reuters) - NGK Corp 5333.T: NGK CORP - TO BUY BACK UP TO 2.3% OF OWN SHARES WORTH 33 BILLION YEN NGK CORP - TO RETIRE TREASURY SHARES ACQUIRED IN LATEST BUYBACK SCHEME Source text: ID:nTSpd7d021 Further company coverage: 5333.T (Reporting by Kiyoshi Takenaka) ((kiyoshi.takenaka@thomsonreuters.com;))