Scandal-hit KYB Corp. on Friday disclosed the names of 70 government and municipal office buildings that used, or are suspected of having used, substandard earthquake shock absorbers in their construction.

The names were supplied by the company, which also admitted products that failed to meet state standards had been used at 11 of them.

"I would like to sincerely apologize for this improper conduct," Keisuke Saito, a senior official at KYB, told a hastily organized and packed news conference in Tokyo on Friday afternoon, as the quality control scandal continued to widen after the firm admitted Tuesday to cheating on inspection data concerning earthquake shock absorbers for more than a decade.