"1934Z"^^ . "Walter D'Arcy Ryan (Kentville, Nova Scotia, Canada, April 17, 1870 \u2013 Schenectady, New York, USA, March 14, 1934) was an influential early lighting engineer who worked for General Electric as director of its Illuminating Engineering Laboratory."@en . "Ryan, Walter D'Arcy"@en . "Walter D. Ryan"@en . "Walter D'Arcy Ryan"@en . "1934-03-14Z"^^ . . "American lighting engineer and inventor" . "1870Z"^^ . . "1870-04-17Z"^^ . . . . . . .