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Mikrokator/johanson leveling block
Mikrokator/Johanson Leveling Block: For use with any precision comparator. Made by CE Johanson. Serial No. 519/1519. There are some etched numbers 6512-282 and also QC7-157. Used, but in very good condition. Document inside of box states "Flat within 1/2 of 1 light band or 0.0000058 inches" when new. 11/4/87. Comes from Pratt & Whitney Precision Tools.
