Electric Power Development Co. and two other firms plan to market a new type of geographic information system in which day-to-day changes in cityscapes and streets can be recorded, the company said Wednesday.

Electric Power Development, a semigovernmental company, is teaming up with Meidensha Corp., a maker of heavy electrical machinery, and Shobunsha Publications Inc., to sell the system, mainly targeting prefectural governments and municipalities, company officials said.

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