<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31419053</termId><termName>petrographic microscopes</termName><termType>PT</termType><termNote><![CDATA[ Microscopes that employ polarized light that vibrates in a single plane so that light can be transmitted through the specimen. It is used to examine thin sections of rocks  and minerals. ]]></termNote><termCreatedDate>2026-03-30 20:52:49</termCreatedDate><relation><relationType>UF</relationType><termId>31419054</termId><termName>microscope, petrographic</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31419055</termId><termName>microscopes, petrographic</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31419056</termId><termName>petrographic microscope</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31419057</termId><termName>petrological microscopes</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31383804</termId><termName>microscopes</termName><termType>PT</termType></relation></term>  </Zthes>