<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31420533</termId><termName>flash powder holders</termName><termType>PT</termType><termNote><![CDATA[ Historical devices of varied design, but usually with a handheld tray intended to hold magnesium flash powder that would be ignited at the moment of exposure of a photographic plate. These were used before the advent of flash bulbs and later electronic flash devices. ]]></termNote><termCreatedDate>2026-03-30 20:53:18</termCreatedDate><relation><relationType>UF</relationType><termId>31420534</termId><termName>flash powder holder</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31420535</termId><termName>holders, flash powder</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31386072</termId><termName>flash equipment</termName><termType>PT</termType></relation></term>  </Zthes>