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Keith Prowse of 48 Cheapside, London.
1796 Company established by Robert Keith.
1832 William Prowse became a partner.
1902 The company was registered on 28 January, to acquire the business of manufacturers of musical instruments, music publishers etc of the firm of the same name. 
1914 Theatrical box agency, entertainment providers, music publishers and pianoforte manufacturers. Employees 250.