 Hallet, Davis & Co. Boston (H&D), is a piano line commonly referred to as Hallet & Davis or H&D.The original Hallet, Davis & Company was formed in Boston in 1843 by Russell Hallet, George H. Davis, and other partners, but dates back to 1835 due to the Brown and Hallet production line.The H&D line is the oldest United States piano name still in production, pre-dating Weber (1852), and Steinway and Sons (1853).