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New Step by Step Map For sewing machine repair boulder

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Microscopic level and maintaining it precisely within the CD's tracks: Objective lens - Top quality focusing lens, similar to a great microscope objective that has a numerical aperture (N.A.) of 0.forty five and focal duration of four mm. (In case you care, the N.A. is defined because the sine of http://emilianoriufq.blog5star.com/2140818/the-5-second-trick-for-sewing-machine-repair-boulder

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