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Frankford arsenal 21-second combination fuse

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Frankford arsenal 21-second combination fuse.jpg Breech in normal position—closedThumbnailsFrankford arsenal centrifugal fusesBreech in normal position—closedThumbnailsFrankford arsenal centrifugal fusesBreech in normal position—closedThumbnailsFrankford arsenal centrifugal fusesBreech in normal position—closedThumbnailsFrankford arsenal centrifugal fusesBreech in normal position—closedThumbnailsFrankford arsenal centrifugal fuses