DescriptionGear - Helical (PSF).png English: Helical Gears Date 16 May 2019 Source Archives of Pearson Scott Foresman, donated to the Wikimedia Foundation...
Geometric Set (PSF).png Geometric 1 (PSF).png Geometric 2 (PSF).png Gear - Helical (PSF).png Gear - Bevel (PSF).png Gear - Spur (PSF).png Geiger Counter...
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