Chubu Electric Power Co. failed to declare about 7.6 billion yen in taxable income in the two-year period to March 2005, while Brother Industries Ltd. failed to declare about 2.2 billion yen in the two-year period to March 2004, tax agency sources said Tuesday.

Organo Corp., a maker of water treatment equipment, concealed about 300 million yen in income in seven years through March 2005, and failed to declare over 400 million yen in taxable income, the sources said, adding that the firm used some of the funds to bribe Gifu officials to win public works contracts.

All three companies are listed on the first section of the Tokyo Stock Exchange.