The IBM 780 CRT Display was a monitor that could be attached to the 740 and mirror to an operator what was being drawn on 740's CRT. The 780 had a 21 inch CRT with a long persistence (2 second, nominal) P7 phosphor.
For a more evolved IBM graphics system seeIBM 2250.
IBM 709 Data Processing System, Form A22-6501-0, 1958.
IBM Archive article about the 740 (http://www-1.ibm.com/ibm/history/exhibits/701/701_1415bx40.html)
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