4. Education and demonstration
  5. Question or problem eliciting response

National Computer Systems, Inc.

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Adjustable read level threshold for optical mark scanning

Registers – Coded record sensors – Particular sensor structure
Patent

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Apparatus for photoelectrically reading a translucent answer doc

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent

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Apparatus utilizing analog-to-digital conversion in the photoele

Registers – Calculators – Input-output calculator to indicator – printer – etc.
Patent

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Carousel tape system

Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
Patent

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Categorized test item reporting method

Education and demonstration – Question or problem eliciting response
Patent

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Profile ID: LFUS-PAI-P-20222

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