Rubuta ci gaba don wannan sakin layi - Magnetophone recorders an yi amfani da su sosai a cikin watsa shirye-shiryen rediyo na Jamus a lokacin Yaƙin Duniya na II, kodayake sun kasance asirin sirri a lokacin. Allies sun san wanzuwar masu rikodin Magnetophon kafin yakin, amma ba game da gabatar da karkatarwar mita mai yawa da kuma tef ɗin da aka tallafa wa PVC ba.) ƙwararrun masu leken asirin su sun san cewa Jamusawa suna da wani sabon nau'in tsarin rikodi amma ba su san cikakkun bayanai game da gini da aiki ba har sai an gano samfuran aiki na Magnetophon yayin mamayewar Allied na Jamus
a lokacin 1944-45.