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The file "O2_calibration_air.png" has 1 identical duplication.

1. O2 calibration air.png . . Gnaiger Erich (talk | contribs) . . 23:53, 7 January 2018
2. O2 sensor test.jpg . . Passrugger Manuela (talk | contribs) . . 09:01, 5 June 2019