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1880 Born in Norwood, London
1911 Norman D Watsham 31, electrical engineer and worker, living in Camberwell with Helen J Watsham 28, Douglas Watsham 3, his father George J Watsham 66, and his brother Hubert J Watsham 18
Around this time, he seems to have gone into business on his own account
1916 Engineer, of Palace chambers, Westminster
1921 The business address of Norman D. Watsham was in Howard House, Strand, London
1922 Norman De Maid Watsham and A. H. S. MacCallum founded British Radiophone Ltd; Byron G. Clark seems to have had some connection with this company. Watshams won an order from Marconi's Wireless Telegraph Co for 2 types of crystal set and a valve receiver; the order for crystal sets was sub-contracted to Plessey Co; it is unclear to what extent British Radiophone Ltd was involved in this order.
By 1923 he was living in Reading
1926 Norman D. Watsham, engineer, and Watshams, electrical engineers, were at 33 King St
1928 Watshams Ltd, Victoria St, London
1929 Living in Reading
1961 Died in Reading