A pair of strabismus diagnostic and exercise cards in black and white. The card to the left, 14, has the image of a hammer over pliers with a screw to the lower right; the card to the right, 14a, has the image of a hammer over pliers with a nail to the left. Stereoskopische Bilder für schielende Kinder.
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Hidden treasure and Is part of: Stereoskopische Bilder für schielende Kinder.; See related catalog record: 52331180R