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Frankford arsenal centrifugal fuses

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Frankford arsenal centrifugal fuses.jpg Frankford arsenal 21-second combination fuseThumbnailsBlock swings free to right of gunFrankford arsenal 21-second combination fuseThumbnailsBlock swings free to right of gunFrankford arsenal 21-second combination fuseThumbnailsBlock swings free to right of gunFrankford arsenal 21-second combination fuseThumbnailsBlock swings free to right of gunFrankford arsenal 21-second combination fuseThumbnailsBlock swings free to right of gun