<?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">Pittsburgh lock seams</topic></authority><related type="broader"><topic>metal seams</topic></related><variant type="other"><topic>Pittsburgh lock seam</topic></variant><variant type="other"><topic>Pittsburgh seam</topic></variant><variant type="other"><topic>seams, Pittsburgh lock</topic></variant> <note xml:lang="en"><![CDATA[ Distinctive sheet metal seams made with one sheet edge turned, double-bent, and locked onto a sheet having a simple bend; usually created using a special Pittsburgh lockforming machine. An example of use for the seam is at the corners of elbows and square or rectangular pipes of ducts. ]]></note></mads>