<?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">Perspex (TM)</topic></authority><related type="other"><topic>polymethyl methacrylate</topic></related><related type="other"><topic>acrylic sheet</topic></related><related type="broader"><topic>brand name materials</topic></related><variant type="other"><topic>perspex</topic></variant> <note xml:lang="en"><![CDATA[ Commercially produced, British acrylic plastic consisting essentially of polymerized methyl methacrylate. Polymethyl methacrylate was discovered in the early 1930s by British chemists at Imperial Chemical Industries in England and trademarked the name Perspex. ]]></note></mads>