<?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">duplex locks</topic></authority><related type="broader"><topic>master-keyed locks</topic></related><variant type="other"><topic>duplex lock</topic></variant><variant type="other"><topic>locks, duplex</topic></variant> <note xml:lang="en"><![CDATA[ Cylinder-type locks with independent pin tumblers, both controlling the same bolt, and operated with dual keys, one a master key designed to control a set of such locks. ]]></note></mads>