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of Pocock Street, Blackfriars Road, London, SE
Previously Martin and Purdie had patented a design of fire bar
1862 W. A. Martin, of 55 Great Sutton Street, London, exhibited patent rocking furnace bars for land and marine purposes.
1867 Patent. '706. William Arena Martin and Edward Wylam, both of No. 18, Cannon-street, in the city of London, for an invention of "improvements in furnace or fire bars and in mounting and giving motion to the same."
1867 Partnership dissolved. '...the Partnership heretofore subsisting between us the undersigned, Edward Wylam and William Arena Martin, as Engineers (carrying on business at No. 90, Cannon-street, in the city of London, under the style or firm of W. A. Martin and Co.), was this day dissolved by mutual consent....'
1880 Advert for smoke consuming doors for furnaces.
1889 Internal friction gear for driving dynamo machines. 
1894 W. A. Martin wrote from Pocock Street, London, S.E.
1895 Article on marine boilers in The Engineer
1897 Mention of a steam motor car made by them and being used in the north 
1899 Partnership dissolved. '...the Partnership heretofore subsisting between us the undersigned, George Shaw and William Arena Martin, carrying on business as Engineers and Patentees, at Nos. 9 and 11, Pocock-street, Blackfriars-road, London, under the style or firm of W. A. Martin and Co., has been dissolved by mutual consent...'
The Automotor Directory for 1900 listed the firm as making steam vehicles but presumably this went to print before the firm was dissolved.