Copy of Drawing of Switchboard, 1929 safety negative Rosenfeld and Sons 1929-08-07 1984.187.35876 Viewetchings album Poole, Burnell 1965.181 ViewLine Drawing of Automatic Regulator, 1929 safety negative Rosenfeld and Sons 1929-06-24 1984.187.35476 ViewPostcard of etching of the CHARLES W. MORGAN postcards Soderberg, Yngve Edward 2009.22.23 ViewEtching of William Cramp etching 2002.5.4 View
