Card grading system

Details Card grading system Card grading system

1975-11-28

1977-06-28

Grieb, William H.

G09B 308

Patent

active

040316360

ABSTRACT:
Grading true-false and multiple-choice foldable answer cards by compacting them and using a key card in front of a pack of the cards as a guide.

REFERENCES:
patent: 2137447 (1938-11-01), Ellis
patent: 2471223 (1949-05-01), Lorber
patent: 3251141 (1966-05-01), MacRae
patent: 3780460 (1973-12-01), Hurt

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