Hello, I recently purchased this instrument as government surplus. I have not been able to identify the maker or figure out exactly what it purpose is. I studied technical photography and lab technics in the early 90's and worked in 4X5 but never came across something like this. The travel on the axis is approx. 4.625 and 3.450. Two OPL LM54 illuminate and magnify the scales and allow placement of the image to thousands of an inch. The back plate is 4X5 . Any information on maker or ideas for its use would be appreciated. Thanks
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