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Category:Optical variables measurement

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A 1897 photo of the 40 inch refractor telescope at the Yerkes Observatory
A 1897 photo of the 40 inch refractor telescope at the Yerkes Observatory

The measurement of visual signals

Pages in category "Optical variables measurement"

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Media in category "Optical variables measurement"

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Retrieved from "http://www.ieeeghn.org/wiki6/index.php/Category:Optical_variables_measurement"
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