DescriptionVacuum Tube (PSF).png English: An electron tube evacuated to a high degree of vacuum Date 6 September 2019 Source Archives of Pearson Scott...
Foresman Permission (Reusing this file) Other versions Vacuum Tube (PSF).png Valance 1 (PSF).png Valance 2 (PSF).png Valve 2 (PSF).png Vamp (PSF).png...
DescriptionGrid (PSF).png Grid Source Archives of Pearson Scott Foresman, donated to the Wikimedia Foundation Author Pearson Scott Foresman Permission...
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