 Air Raid Precautions whistles were made during the next few years and dated whistles for army, navy and Royal Air Force equipment and for Civil Defence.In 1949 the firm was re-constituted as J. Hudson & Co. (Whistles) Ltd. Leon C. Hudson became its first managing director.The 1950s and 60s marked growing demand for Hudson sports whistles, Olympics and other sport events on five continents.