From Science News Letter, July 5, 1958

DEVICE PAGES DOCTORS — A pocket radio that whistles to let you know somebody is trying to reach you by telephone is part of a page-you-anywhere telephone system undergoing tests in the Allentown-Bethlehem, Pa., area. Doctors, lawyers and other persons who must maintain immediate and economical contact with their offices can be signaled anywhere in the two-city area, C.