<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31446763</termId><termName>proving mortars</termName><termType>PT</termType><termNote><![CDATA[ Short squat guns or cannons used to test the strength of coarser blasting powders, used mainly 18th-19th centuries. ]]></termNote><termCreatedDate>2026-03-30 21:07:40</termCreatedDate><relation><relationType>UF</relationType><termId>31446764</termId><termName>proving mortar</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31446671</termId><termName>mortars</termName><termType>PT</termType></relation></term>  </Zthes>