<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31399187</termId><termName>aviator&apos;s helmets</termName><termType>PT</termType><termNote><![CDATA[ Casques intended for the protection of those flying aircraft. These were initially made of leather, were fitted to the head and had earflaps that were connected via a chin strap. Some were lined with fleecy material. More historically recent models are made from a variety of materials including fiberglass and plastic, and are more typically formed into a round dome encasing the entire head of the wearer. ]]></termNote><termCreatedDate>2026-03-30 20:47:16</termCreatedDate><relation><relationType>UF</relationType><termId>31399188</termId><termName>aviator&apos;s helmet</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31358754</termId><termName>helmets</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31314604</termId><termName>aviators</termName><termType>PT</termType></relation></term>  </Zthes>