- Grand Mound is a community and census-designated place (CDP) in Thurston County, Washington, United States. It was named and founded by Jotham Weeks Goodell, father of Phoebe Judson, in 1851. The population was 3,301 at the 2020 census. This area uses the 98579 and 98531 zip codes, which also includes Rochester and Gate.
- Vacuum tube (Wikipedia)
A vacuum tube, electron tube, thermionic valve (British usage), or tube (North America) is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. It takes the form of an evacuated tubular envelope of glass or sometimes metal containing electrodes connected to external connection pins.