I think it is for a microscope. The part below the slide and above the light source. The tinted lenses being used with staining pigments. The...
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It is 4.675" diameter .375" thick. Inner circles are 1" diameter. Found in northeast Ohio USA. We thought it was something for a projector...
This was found in the garden when tilling. We have no idea what it is. Can anyone tell us what this is?
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