"Delta" Corning Precision Lenses. Three powerful lenses that could be used as magnifiers or repurposed for an interesting use. Good magnifying lenses inside. Parts for projection TVs. Doesn't look like they were used. You can view videos on this product on UTube to get an idea as to their reuse. The 78s have a blue colour and the 79 has a red emitting off the bottom lenses.
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