Sketchpad: a man-machine graphical communication system
AFIPS '63 (Spring) Proceedings of the May 21-23, 1963, spring joint computer conference
The RAND tablet: a man-machine graphical communication device
AFIPS '64 (Fall, part I) Proceedings of the October 27-29, 1964, fall joint computer conference, part I
The Sylvania data tablet: a new approach to graphic data input
AFIPS '68 (Spring) Proceedings of the April 30--May 2, 1968, spring joint computer conference
A head-mounted three dimensional display
AFIPS '68 (Fall, part I) Proceedings of the December 9-11, 1968, fall joint computer conference, part I
A system for automatic acquisition of three-dimensional data
AFIPS '77 Proceedings of the June 13-16, 1977, national computer conference
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During the past fifteen years, use of two-dimensional computer input/output devices has become commonplace. Since the earliest uses of the light pen for target identification in air defense systems it has been obvious that two-dimensional input would be interesting and useful. A large number of two-dimensional tablets and digitizers have been developed and have come into quite effective use. These devices have made use of mechanical, electrical, magnetic, optical, and acoustic phenomena. (See bibliographical references.)