SELF-TEST DEVICE FOR PUPIL INSTRUCTION BY CORRESPONDENCE Russian patent published in 1997 - IPC

Abstract RU 2073911 C1

FIELD: devices for education. SUBSTANCE: card with questions and answers is mounted in housing for movement by means of unit which is designed as flanges which bent this card. Card encoding unit is designed as rib which is located on one flange and which follow curve shape. Housing is designed as folder with flaps. EFFECT: increased functional capabilities. 3 dwg

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RU 2 073 911 C1

Authors

Ivanov Vladimir Nikolaevich

Dates

1997-02-20—Published

1992-11-02—Filed