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Frankford arsenal 21-second combination fuse

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Frankford arsenal 21-second combination fuse.jpg 5 inch R.F. gun and breech mechanismThumbnailsrotating crank-catch turned 90° 5 inch R.F. gun and breech mechanismThumbnailsrotating crank-catch turned 90° 5 inch R.F. gun and breech mechanismThumbnailsrotating crank-catch turned 90° 5 inch R.F. gun and breech mechanismThumbnailsrotating crank-catch turned 90° 5 inch R.F. gun and breech mechanismThumbnailsrotating crank-catch turned 90°