Image: WilliamsTubeFigure1f

Description: Figure 1 from the 1947 US Patent 2951176 on the w:Williams tube, perhaps the earliest successful computer memory.
Title: WilliamsTubeFigure1
Credit: US Patent 2951176 (http://www.google.com/patents?vid=2951176)
Author: Frederic Calland Williams
Permission: Public domainPublic domainfalsefalse The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s) The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as Template:PD-ineligible.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No