Terminal plate, gutta percha(?), rectangular with five brass terminal joints in one line down middle of plate, Riviere apparatus, European, 1880-1930 Terminal plate 1880-1930
Wood board with five terminals (one missing) in two rows of three wired underneath board in series, riviere material, European, 1880-1930 Wood board with five terminals (one missing) in two rows of three wired underneath board in series 1880-1930
