NASA NTRS · 19650000003
Illuminated display panel is easily changed
Abstract
Photographic negative placed between two plastic sheets and back-lighted in selected areas prepares illuminated multicolored display panels. The device is inexpensive, easily changed, and quickly fabricated.
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1965-01-01. Illuminated display panel is easily changed. https://ntrs.nasa.gov/citations/19650000003
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