A display of Sentry information as related to guarding for explosions in the mine. At the Big Pit National Coal Museum in Pontypool, Wales, United Kin

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A display of Sentry information as related to guarding for explosions in the mine. At the Big Pit National Coal Museum in Pontypool, Wales, United Kingdom.

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Size: 6067px × 4045px
Location: Big Pit National Coal Museum, Pontypool, Wales, United Kingdom
Photo credit: © James Talalay / Alamy / Afripics
License: Licensed
Model Released: No

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