Describes an improved relief-drawing set that allows durable, tangible, and visible embossed images to be made with a ball-point pen.
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References
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BoumaH., EngelF.L., and MelotteH.E.M.Technological devices for the visually handicapped: Gap between research effort and available aids.I.P.O. Annual Progress Report, 1972, 7, 46–54.
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