Alternating frame door.
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Previously:
100-year-old bank vault door - photo
Concealed door lock - GIF
Custom multi-point locking door - GIF
Dual opening garage door - GIF
Fixing a sagging door - GIF
Rotten wood door frame repair - GIF
Secret hidden door - GIF
Triangular folding cabinet doors - GIF
Unique folding door design - video
