Sliding silo blast door (Cold War Missile Silo and Command Bunker)

A ballistic sliding closure: a 6.2 m concrete slab with banded steel edges, lifting eyes and eight rollers, parked open at the far end of an 11.6 m twin rail track, with the bore ring at the closed end and a gas generator actuator with a push rod.

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CC0 — free for any use, no attribution required