 Complete the following phrase:  On 9 January 1881 William Watson died. In 1883, the name of the company was changed to W. Watson  Sons as the son, Charles Henry Watson joined the business. The 1883 Kellys Business Directory listed both Charles Henry Watson and Henry Watson as associated with the Watson  Sons company located at 23 Walton Street, Aylesbury, England. In 1889, the company participated in the formation of a Photographic Trades Section of the London Chamber of Commerce. In 1894, the company exhibited scientific instruments at the 