A test for defective colour vision
- Made:
- 1955-1975
A test for defective colour vision, electromechanical counter in 'home-made' wooden box, 1955-1975. (BPS Inv. No. 0073)
A test for defective colour vision, electromechanical counter in 'home-made' wooden box, 1955-1975. (BPS Inv. No. 0073)