Original World War 2 electronic tubes industry trade magazine vintage ad for YORK ICE MACHINERY CORPORATION of York, PA. Jones, Perry, Farragut, Wired for Sound!  In applying the newest electronic theories to the needs of war, communications, navigation and control devices, the US Navy brings to the ancient art of sea fighting mystifying ultra modern aids. Electronic tubes must be made in a dust free atmosphere of low humidity.  York Refrigeration and Air Conditioning for War.  Old 1943 WW2 wartime era propaganda magazine advertisement.