<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">stereoviewers</topic></authority><related type="other"><topic>View-Masters (TM)</topic></related><related type="broader"><topic>photograph viewing equipment</topic></related><variant type="other"><topic>stereoviewer</topic></variant><variant type="other"><topic>view master</topic></variant> <note xml:lang="en"><![CDATA[ A stereoscopic viewing device that uses a wheel or reel of slides to present two images, isolated for each eye, that together create a three-dimensional optical effect. Invented by William Gruber in 1938 as an educational device, it has been marketed as a children's toy since that time under the trademarked name "View-Master." For the device used to view individual stereo cards, popular in the 19th century, use "stereoscopes." ]]></note></mads>