Since 1931, Fisher has been a trusted name in metal detection. This company’s history began in the late 1920’s, when German immigrant Dr. Gerhard Fisher obtained the first patent ever issued on aircraft radio direction finders. He was working as a Research Engineer in Los Angeles, California at the time and his work attracted the interest of Dr. Albert Einstein. After a demonstration of Dr. Fisher’s equipment, Einstein enthusiastically and correctly predicted the world-wide use of radio direction finders in the air, on land and at sea.