TOKYO -- Japanese component maker Mitsubishi Materials Corp. said Tuesday that it has uncovered more cases of data falsification and inspection improprieties, adding to the woes of the firm whose subsidiaries were recently found to have rigged data.

Mitsubishi Materials President Akira Takeuchi conceded that the latest scandal had caused widespread trouble.

"I want to offer a deep apology for causing extensive trouble," Takeuchi told a press briefing on the matter in Tokyo on Tuesday.

According to the firm, one of its subsidiaries, Mitsubishi Cable Industry Ltd., was found to have not conducted inspections on some of its sealing products, such as those used to join pipes, and rigged data related to magnetic wires for use in electrical equipment.