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I learned database normalization the hard way

Learn database normalization through this tutorial that covers key concepts and processes of 1NF, 2NF, and 3NF. Discover ...
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Loewe type 3NF multiple triode

A multi-triode with a 6-pin plastic base, extra lead wire extends from stem press. Tipped T-shaped envelope. Marked: "Loewe Radio / 3NF / [Fil] volts 4,0 / [Fil Current] 0,34 Amps / Anode [volt] 150".