Three men who broke into nine offices in industrial buildings were jailed yesterday for up to 28 months. Jen Chienlun, 51, Heung Yuk-kau, 38, and Lau hei-yin, 42, admitted a series of burglaries in Kowloon City, Kwun Tong and Kwai Chung between October last year and February this year. They stole diamonds, paintings, notebook computers, jewellery and boxes of perfume, the District Court heard. Lau, who was the driver, was jailed for a shorter term, 20 months.