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However, it was not until the early 20th century that systems able to use these principles were becoming widely available, and it was German inventor Christian Hülsmeyer who first used them to build a simple ship detection device intended to help avoid collisions in fog (Reichspatent Nr. Numerous similar systems, which provided directional information to objects over short ranges, were developed over the next two decades.The development of systems able to produce short pulses of radio energy was the key advance that allowed modern radar systems to come into existence.A key development was the magnetron in the UK, which allowed the creation of relatively small systems with sub-meter resolution.By the end of hostilities, Britain, Germany, the United States, the USSR, and Japan had a wide diversity of land- and sea-based radars as well as small airborne systems.Increases in signal processing capability due to the introduction of solid state computers has also had a large impact on radar use.

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This possibility was suggested in James Clerk Maxwell's seminal work on electromagnetism.

On the one hand, radar contributed very little to theory, which was largely known since the days of Maxwell and Hertz.

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