 <unk> philosopher Ramon Llull ( <unk> – <unk> ) developed several logical machines devoted to the production of knowledge by logical means ; Llull described his machines as mechanical entities that could combine basic and undeniable truths by simple logical operations , produced by the machine by mechanical meanings , in such ways as to produce all the possible knowledge . Llull 's work had a great influence on Gottfried Leibniz , who redeveloped his ideas . 
