<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31395232</termId><termName>rhythmicons</termName><termType>PT</termType><termNote><![CDATA[ Electronic percussion instruments developed in the 1930s, involving a series of rotating wheels that interrupt beams of light to produce complex rhythms very precisely, controlled from a keyboard. ]]></termNote><termCreatedDate>2026-03-30 20:46:15</termCreatedDate><relation><relationType>UF</relationType><termId>31395233</termId><termName>polyrhythmicons</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31395234</termId><termName>rhythmicon</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31355244</termId><termName>electronic instruments</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31355269</termId><termName>keyboard instruments</termName><termType>PT</termType></relation></term>  </Zthes>