EntityQ1606934· pop 6· linked from 28 articlesH. J. RoundSign in to saveBritish inventor (1881–1966)ConnectionssonarEntityWorld War IIConceptWorld War IConceptInternational Standard Book NumberEntityGuglielmo MarconiEntityWayback MachineEntitydigital object identifierEntityinductorEntityStaffordshireEntitylight-emitting diodeEntityWilhelmshavenEntityImperial College LondonEntitybibcodeEntityBattle of JutlandEntityfeedbackEntityLee de ForestEntityWestern FrontEntitysilicon carbideEntitytriodeEntityEdwin Howard ArmstrongEntityCategories1881 births1966 deaths20th-century English inventorsBritish Army personnel of World War IEnglish electrical engineersIntelligence Corps officersLight-emitting diode pioneersPeople educated at Pate's Grammar SchoolPeople from DudleyRadio pioneersRecipients of the Military Cross