Middleby Corp., the Elgin, Ill.-based multi-brand foodservice, residential and food processing equipment conglomerate, announced Dec. 21 that it has acquired United Foodservice Equipment Group, a manufacturer of countertop foodservice equipment based in Zhuhai, Guangdong, China. Terms of the deal were not announced, but Middleby said the company has annual revenues of about US$10 million. United…