<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31415819</termId><termName>arc lamps</termName><termType>PT</termType><termNote><![CDATA[ Electric lamps in which the current is made to traverse an air gap between two electrodes, usually of carbon. The air in the gap as well as the two electrodes become heated to a brilliant incandescence. ]]></termNote><termCreatedDate>2026-03-30 20:51:53</termCreatedDate><relation><relationType>UF</relationType><termId>31415820</termId><termName>Holmes arc lamps</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31415821</termId><termName>arc lamp</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31415822</termId><termName>arc lamps, Holmes</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31415823</termId><termName>arc lights</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31415824</termId><termName>lamps, Holmes arc</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31415825</termId><termName>lamps, arc</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31415826</termId><termName>lights, arc</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31379682</termId><termName>electric lamps</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31345354</termId><termName>lighthouse lamps</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31402855</termId><termName>electric arcs</termName><termType>PT</termType></relation></term>  </Zthes>