E. & B. Holmes Machinery Company Building, also known as The Cooperage, is a historic factory building located at Buffalo in Erie County, New York. It is a roughly rectangular brick building composed of three primary sections of four-, three-, and two-stories, which encircle a central courtyard. The three sections are the Mill Building, Forge Building, and Pattern Building (1913). The E. & B. Holmes Machinery Company revolutionized the barrel making industry by patenting the design and manufacturing of machinery used for mass-producing barrels. The company operated from 1840 until 2002.