<?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">clock and program systems</topic></authority><related type="broader"><topic>communication systems</topic></related><variant type="other"><topic>clock and program system</topic></variant><variant type="other"><topic>school clock and program systems</topic></variant><variant type="other"><topic>systems, clock and program</topic></variant> <note xml:lang="en"><![CDATA[ Systems that bring several clocks into conformity, and may ring bells or alarms at scheduled intervals. ]]></note></mads>