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1875 Josiah Latimer Clark was senior partner in the firm of Latimer Clark, Muirhead and Co, formed to manufacture electrical apparatus and machinery.
1879 "... the Partnership lately subsisting between Latimer Clark, John Muirhead, and John Muirhead the younger, as Electric Telegraph Engineers, at No. 29, Regency-street, Westminster, under the style or firm of Latimer Clark, Muirhead, and Co., was, on the 31st day of December, 1879, dissolved, by mutual consent, so far as regards the said John Muirhead, who retires from the said firm."
1881 Developed a block signalling apparatus for railway use
1889 Provisional order granted for lighting Richmond
1894 Voluntary winding-up under court supervision