Xerographic method for making a responsive answer system

Details Xerographic method for making a responsive answer system Xerographic method for making a responsive answer system

1973-11-27

1976-02-17

Klein, David

Gas separation: apparatus

Magnetic separating means

35 9R, 35 48A, 427 22, 427 23, 427 24, G03G 1320, G03G 1322, G03G 1520

Patent

active

039389936

ABSTRACT:
Permanent, meaningful information is so associated with removable, confusing information, at least some of which is usually similar in character to said permanent, meaningful information, as to make it effectively impossible for an observer to discriminate between the two types of information even though both types of information in the association may be legible. Such a system is advantageously used in instructional systems and particularly in responsive answer formats.

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patent: 3411932 (1968-11-01), Malone et al.
patent: 3519253 (1970-07-01), Aser et al.
patent: 3788873 (1974-01-01), Detig

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