We are involved in a patent dispute and have found a physical display example of significance. Now we need to demonstrate that the display was actually utilized and we are seeking photographic evidence OR like proof of it in use (1950's / 1960's).
I've attached an image of a display that is similar to what we need, although the display we seek is a bit different. This picture shows the display with ALL D size batteries and our physical example holds AA & C size together combined in one version. That is the version we are seeking evidence of.
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