| Original title | The Big Sleep | 
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| Danish title | Marlowe går til sagen | 
| Leikstjórn | Michael Winner | 
| Screenplay | Michael Winner | 
| Based on | Efter Raymond Chandlers roman. | 
| Director of Photography | Robert Paynter | 
| Editor | Frederick Wilson | 
| Composer | Jerry Fielding | 
| Production designer | Harry Pottle | 
| Appearance | Robert Mitchum, Sarah Miles, Richard Boone | 
| Land | Storbritannien | 
| Domestic distribution | Nordisk Films Kompagni | 
| Technical info | 35 mm, Widescreen, Deluxe, Tone | 
| Danish theatrical release | 31.01.1980 | 
| Cinemas | World Cinema | 
      Companies | 
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| Production company | Winkast Film Productions | 
| Domestic distribution | Nordisk Films Kompagni | 
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      Instruktion | 
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| Instruktion | Michael Winner | 
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      Manus | 
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| Manus | Michael Winner | 
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      Produktion | 
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| Produktion | Elliott Kastner | 
| Produktion | Michael Winner | 
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      Foto | 
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| Foto | Robert Paynter | 
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      Klip | 
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| Klip | Frederick Wilson | 
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      Musik | 
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| Musik | Jerry Fielding | 
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      Produktionsdesign | 
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| Produktionsdesign | Harry Pottle | 
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      Medvirkende | 
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| Medvirkende | Robert Mitchum | 
| Medvirkende | Sarah Miles | 
| Medvirkende | Richard Boone | 
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