Computran Model AN 7 binary-number computer trainer
4 x 20 1/2 x 4 1/2 in.
Object consists of a wooded frame holding a rod on which seven wooden paddles rotate. The wooden paddles are marked on one side with the numeral "1" and on the other side with the numeral "0." The wooden frame is in its original maufacturer's blue and white printed cardboard box.