067-0544-00
The Tektronix 067-0544-00 is a calibration plug-in for the 647 and the 647A.
It was formerly sold as the 10/11M1, and before that, as the 035-5001-00.
It is shown on page 10 of the 1980 Calibration Fixtures Catalog.
035-0544-00
10/11M1
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10/11M1
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10/11M1