<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31428169</termId><termName>gradiometers</termName><termType>PT</termType><termNote><![CDATA[ In magnetometry, devices with multiple sensors that measure the gradient of magnetic fields. ]]></termNote><termCreatedDate>2026-03-30 20:55:30</termCreatedDate><relation><relationType>UF</relationType><termId>31428170</termId><termName>gradiometer</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31398432</termId><termName>magnetometers</termName><termType>PT</termType></relation></term>  </Zthes>