| Original title | Das andere Ich |
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| Danish title | Frk. Dag og Frk. Nat |
| Other titles | Frøken Dag og Nat, Frk. Dag og Nat |
| Leikstjórn | Wolfgang Liebeneiner |
| Screenplay | Heinrich Spoerl |
| Director of Photography | Friedl Behn-Grund |
| Composer | Werner Bochmann |
| Production designer | Otto Erdmann, Franz F. Fürst |
| Appearance | Hilde Krahl, Mathias Wiemann, Erich Ponto, Harald Paulsen |
| Land | Tyskland |
| Domestic distribution | Tobis |
| Technical info | Tone |
| Danish theatrical release | 23.02.1942 |
| Cinemas | Metropol (Strøget) |
Companies |
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| Production company | Tobis |
| Domestic distribution | Tobis |
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Instruktion |
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| Instruktion | Wolfgang Liebeneiner |
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Manus |
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| Manus | Heinrich Spoerl |
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Produktion |
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| Produktionschef | Kurt Moos |
| Produktionschef | Heinz Sander |
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Foto |
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| Foto | Friedl Behn-Grund |
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Musik |
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| Musik | Werner Bochmann |
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Produktionsdesign |
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| Produktionsdesign | Otto Erdmann |
| Produktionsdesign | Franz F. Fürst |
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Medvirkende |
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| Magdalena | Hilde Krahl |
| Martin | Mathias Wiemann |
| Den gamle Geheimeraad | Erich Ponto |
| Overingeniøren | Harald Paulsen |
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