Enoch Robinson & Willam Hall: “Latch of Door and Other Locks.” US Patent No. 1995 1841 E. Robinson & Co., Manufacturer
1843 William Hall leaves E. Robinson & Co.; founds Wm. Hall & Co., 27 Dock Square, Boston, Mass.
1847 MCMA Exhibition at Faneuil and Quincy Halls, Boston. Among the exhibitors are Enoch Robinson, William Hall, and George B. Lothrop.