<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31395230</termId><termName>ondes Martenot</termName><termType>PT</termType><termNote><![CDATA[ Monophonic, nonimitative electronic instruments, invented by Maurice Martenot in 1928. The tone is generated by the heterodyne action between a fixed and a variable radio-frequency oscillator, the latter being controlled by a seven-octave keyboard and the relative proximity of the player's hand to a horizontally stretched cord. ]]></termNote><termCreatedDate>2026-03-30 20:54:47</termCreatedDate><relation><relationType>UF</relationType><termId>31395231</termId><termName>ondes musicales</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31395387</termId><termName>electronic keyboards</termName><termType>PT</termType></relation></term>  </Zthes>