<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31321112</termId><termName>block chains</termName><termType>PT</termType><termNote><![CDATA[ Chains comprising transverse blocks or cylinder units, joined by side links and held in place by pins. The blocks engage a driving wheel with teeth. An example of a block chain is used to rotate bicycle wheels and on other mechanical devices. ]]></termNote><termCreatedDate>2026-03-30 20:26:34</termCreatedDate><relation><relationType>UF</relationType><termId>31321113</termId><termName>block chain</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31321114</termId><termName>blockchains</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31321115</termId><termName>chains, block</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31306340</termId><termName>chains</termName><termType>PT</termType></relation></term>  </Zthes>