Does anyone have some information on this German or Swiss gun maker who is listed as a Gun maker in London 1913-1914? He is best known for making and selling the Mueller Patent Revolver in the UK during this time. I would be interested in any information about his schooling, apprenticeship, examples of long guns he made, etc. I would also like to know if he traveled back to the Continent or the USA at the onset of the Great War. He maybe related to a Mueller who in 1911 submitted a machine gun to the British Army. It was not adopted. Of course the name was probably Anglicized and originally was Muller with an umlaut over the "u". This is a request from an author.