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Apparatus for producing automatic scatter fire of a machine gun and for similar purposes
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Separable structure
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Separable frame and connected block structure
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Joist for joist and tile construction for floors and the like
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Tile for joist and tile construction for floors and the like
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Transmission-line tower
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Arch and beam manufacture and products
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Arch joist and floor construction
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Tubular frame structure
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Lever arch
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Tubular structure
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