 Moving to Yokohama, Japan in 1864, Copeland first worked in the dairy business and then set himself up as a brewer in 1869 with the Spring Valley Brewery, which was located at the site of a natural spring next to the Amanuma Pond below the Yamate foreign residential neighborhood, where he dug a 210-meter cave into the side of a hill and used its low fixed temperature to help the beer mature.After Louis Pasteur invented pasteurization, Copeland was quick to adopt the new technique in his factory.Copeland produced three varieties of beer