Amazing test box for, it seems, to be able to qualify the handicap of a color blind person. This is a battery of tests where a number is assigned to a piece of colored wool. The explanation of Profess[...]
SIGNED BY DAVIS & SON IT IS PROVIDED WITH TWO LARGE TWO-LEVEL PINS AND A BALL-JOINT FOOT. THE COMPASS IS PROTECTED BY A LARGE COVER. THE BOX 26X18X7 Cm.
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