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* [https://richardsears.files.wordpress.com/2014/04/tektronix-s-30-delta-standards.jpg Internal photo of S-30 on Richard Sears' Webpage] | * [https://richardsears.files.wordpress.com/2014/04/tektronix-s-30-delta-standards.jpg Internal photo of S-30 on Richard Sears' Webpage] | ||
<gallery> | |||
Tek s-30 old 1.jpg|S-30 old style | |||
Tek s-30 old 2.jpg|S-30 old style | |||
Tek s-30 old 3.jpg|S-30 old style | |||
Tek s-30 old 4.jpg|S-30 old style | |||
</gallery> | |||
[[Category:Calibration fixtures]] | [[Category:Calibration fixtures]] |