מבחר למעשה תואר הפועל who invented radar מתקבל על הדעת עמיד גבול
Weather eye: the development of radar | The Times
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Robert Watson-Watt - Wikipedia
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Sir Robert Alexander Watsonwatt18921973 Inventor Radar Editorial Stock Photo - Stock Image | Shutterstock Editorial
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Heroes of World War II, 1, The Men Who Invented Radar | Alexander Street, part of Clarivate