| Role | High-altitude reconnaissance aircraft |
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| National origin | United States |
| Manufacturer | Lockheed Skunk Works |
| Designer | Clarence "Kelly" Johnson |
| First flight | 1 August 1955 |
| Introduction | 1957 |
| Produced | 1955–1989 |
| Number built | 104 |
| Unit cost |
$950,000 (1955) ($6.8 million in 2016 dollars) |
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