Registers – Coded record sensors – Particular sensor structure
Patent
1976-08-17
1977-10-04
Grieb, William H.
Registers
Coded record sensors
Particular sensor structure
35 9A, 235 6112R, G09B 700
Patent
active
040516083
ABSTRACT:
A hand-held teaching machine is used in conjunction with a card having recorded thereon columns of visually readable statements of a plurality of problems and corresponding columns of machine readable answers. The machine has viewing apertures for allowing a student to view individual problems presented on the record member in either an equation or algorithm format and an answer display positionally associated with the viewing apertures for displaying the answer entered on the machine keyboard. Means are included in the machine for allowing the digits of a multidigit answer to be entered either from right to left or left to right, and for causing the display to flash repeatedly if the entered answer is correct. Means are also provided for storing information identifying which of the attempted problems were answered incorrectly and retrieving the stored information in response to a predetermined interrogation signal. The machine also has means for allowing it to be used as a calculator.
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Grieb William H.
Weingram Edward R.
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