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Electron Microscopy Sciences NBS 5 Bar Test Ref 1963A BS 4657
Supplier: Electron Microscopy Sciences 6809811
This consists of elements of 5 bars ranging from 1 line per mm to 18 lines per mm, with adjacent numbers indicating the number of lines per mm. Produced as a vacuum deposited chrome image on B270 75 mm x 75 mm glass.
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