<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31307689</termId><termName>photophones</termName><termType>PT</termType><termNote><![CDATA[ Instruments for transmitting sound by means of light, especially those invented by Alexander Graham Bell and Sumner Tainter in 1880. ]]></termNote><termCreatedDate>2026-03-30 20:22:48</termCreatedDate><relation><relationType>UF</relationType><termId>31307690</termId><termName>photophone</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31299038</termId><termName>sound devices</termName><termType>PT</termType></relation></term>  </Zthes>