. . . . . . . . . "Norden Systems"@en . . . . . "Norden Systems"@en . "United States"@en . . "Norden-Ketay"@en . . . . . . . . . . . . . "Norden Instruments"@en . . "Norden Systems was an American manufacturer of radar systems."@en . . . "Norden-Ketay"@en . . . . . "Closed"@en . . . . "Norden Systems was an American manufacturer of radar systems."@en . . . . . . ""@en . "Norden Instruments"@en . "Closed"@en . . . . . . . "4184"^^ . ""@en . . . . "Norden Systems"@en . . . "Norden Laboratories Corporation"@en . . "1058346371"^^ . . . . "1943"^^ . . . ""@en . . "67897856"^^ . . . . . . . "Norden Laboratories Corporation"@en . . . . "Theodore H. Barth"@en . . . . . .