File:Vintage Philips E424N Triode Vacuum Tube With 4-Pin Base, Made In Netherlands (34739369305).jpg - Wikimedia Commons
File:1965 c1960s vacuum tube, 7025A-12AX7A, QC, Philips, Great Britain.jpg - Wikipedia
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Philips 1701 vacuum tube | National Museum of American History
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File:Philips Miniwatt C1, CY1 and CF1 Vacuum Tubes (11252067176).png - Wikimedia Commons
