I have never used one, but I believe it was a sliding adaptor that you would put on in place of the normal groundglass/plate holder assembly. One end of the slide was the normal ground glass, the other was a Graflock type holder for a rollfilm magazine or similar. The idea being that you could focus on the groundglass, slide it out of the way while sliding a rollfilm back into place in one movement.
I guess it could be used with any back that fits a 4X5 Graflock. Polaroid? Digital??
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