coaxial speaker
... that the Altec Lansing 604 coaxial speaker became the standard U.S. studio monitor after 1945?
... that the <a href="./Altec_Lansing" id="mwD54" rel="mw:WikiLink" title="Altec Lansing">Altec Lansing</a> 604 <b id="mwD58"><a class="mw-redirect" href="./Coaxial_speakers" id="mwD6A" rel="mw:WikiLink" title="Coaxial speakers">coaxial speaker</a></b> became the standard U.S. <a href="./Studio_monitor" id="mwD6E" rel="mw:WikiLink" title="Studio monitor">studio monitor</a> after 1945?