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The rise of a professional user base forced an improvement in the quality of cement, and also the development of a multiplicity of different cement types not all Portland based. There are a lot of other things that we can re use (even an old sewing machine can make a beautiful table), we just need to be a little creative. Johnson maintained in his memoirs that his product was far superior to that of Aspdin (a tenuous claim not borne out by independent tests at the time) and implied that it was he alone who had discovered the necessity of producing clinker.