Letter, 16 October 1898
Letter, 19 December 1894
Letter, 6 December 1894
Letter, 25 November 1894
Letter, 3 September 1892
Letter, 6 October 1890
Letter, 31 December 1883
Letter, 15 December 1964
Letter, 5 July 1899
Northern Electric Co. Ltd. Research & Development Project
Northern Electric Co. Ltd. Research & Development Project