This is the original SVG file used for creating this screenshot https://inkscape.org/en/gallery/item/5616/ on Screenshots page.
Note that because of a bug, the symbols in the SVG file don't show up on the internet. So the symbols for this file (custom symbols, not from a pre-existing library) can be found in the Symbols dialog, and they can be used in Inkscape. But showing on the canvas when you first download, they are just the original paths/groups, so that they show up here in the gallery.
Please feel free to download and study :-)