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GB627190A
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Improvements in storage bins or the like
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GB635099A
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Improvements relating to the conveying of powdered or finely-divided material
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GB576213A
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Improvements relating to the conveying of powdered or finely-divided material
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DE738556C
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Device for triggering a signal when a specified dust bunker is reached
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DE741210C
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Mobile conveyor device for grainy or powdered goods
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DE761099C
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Feeding screw for long-haul systems working with compressed air
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