Vintage vault door.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
Previously:
Minuteman II missile silo blast door - photo
Japanese city door typhoon barrier - photo
Secret hidden door - GIF
Underground missile door mechanism - video
Pull-through key that forces you to lock door after opening - video
Tape measure sliding door mechanism - GIF
Unique folding door design - video
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