In the empirical analysis a mapping method of the technological capabilities of multinational
telecommunication manufacturers is applied. It is found that the changes in technological capabilities over time at the firm level are relative stable but at the same time that changes at the industrial level fluctuate more. Secondly using the patent activity to illustrate the relative technological strength of the industry the same picture is provided. Illustrated at the single technological fields the changes are rather stable, but the overall industry has become more concentrated.