- Bezeichnung: Dreieckrechner
- Anforderungszeichen: Fl.XXX
- Baumuster: DR 2 (2.Modell)
- Hersteller: C.Plath, Hamburg
- Baujahr: ca. 1939
- Besonderheit: Ohne Kennzeichnung mit Anforderungszeichen und Gerät-Nummer, sowie ohne Baujahr. Vermutlich für die Schweizer Luftwaffe produziert.
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