Mini-serie i 4 afsnit.
| Original title | En nøgle til |
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| Danish title | En nøgle til |
| Other titles | En nøgle til...? |
| Leikstjórn | Frits Raben |
| Screenplay | Lulu Gauguin |
| Producer | Frits Raben |
| Director of Photography | Henrik Herbert |
| Appearance | Troels Møller Pedersen, Anja Miehe-Renard, Niels Skousen, Karl Stegger |
| Land | Danmark |
| Domestic distribution | Danmarks Radio |
| TV release | 20.04.1970, DR |
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| Production company | DR [TV-Teaterafdelingen] |
| Domestic distribution | Danmarks Radio |
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Instruktion |
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| Instruktion | Frits Raben |
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Manus |
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| Manus | Lulu Gauguin |
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Produktion |
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| Producer | Frits Raben |
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Foto |
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| Foto | Henrik Herbert |
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Medvirkende |
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| Paul | Troels Møller Pedersen |
| Rikke | Anja Miehe-Renard |
| Mikkel | Niels Skousen |
| Rudolf | Karl Stegger |
| Emma | Tove Maës |
| Ruth | Elin Reimer |
| Tove | Iben Wurbs |
| Portier | Jørgen Weel |
| Tjenerelev | Benny Hansen |
| Ekspeditrice | Else Petersen |
| Receptionist | Thecla Boesen |
| Den lille pige | Louise Miehe-Renard |
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