ELECTRO- MAGNETIC APPARATUS FOR UNLOCKIXG LOCKED SAFETY LAMPS from the Article APPLICATIONS OF ELECTRICITY IN THE COLLIERIES OF GREAT BRITAIN. By Sydney F. Walker. from The Engineering Magazine Devoted to Industrial Progress Volume XIX 1900 The Engineering Magazine Co

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Size: 1459px × 2936px
Location: United Kingdom
Photo credit: © Historic Illustrations / Alamy / Afripics
License: Licensed
Model Released: No

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