R.H. wrote:

notice the dark dots in the graph and by the numbers, I don't
think they're meaningful, but someone was asking about wear marks so I
thought they might want to see the unaltered photos.


Could the scale on the side be a calibration chart, similar to that used
on RF components today?

http://www.torontosurplus.com/rfp/DATA1260.JPG


Kevin Gallimore

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