sentences:  The firm went public in 1986, and in 1987 moved into a new headquarters and production facility in Grandville, Michigan.By 1990, the firm shifted emphasis to the field of color measurement.In 1966 it purchased H. Miller Graphic Arts of England; in 2006 it purchased Amazys, owners of Gretag–Macbeth and thereby the Munsell products; in 2007 it acquired Pantone, Inc.