GB325169A
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Improvements in or relating to the manufacture of hollow metal rods, bars and the like
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GB299237A
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Improvements in or relating to the manufacture of hollow metal rods, bars, and the like
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GB291161A
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Improvements in the manufacture of hollow metal bars
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GB291147A
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Improvements in or relating to the manufacture of hollow metal rods, bars and the like
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GB268955A
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Improvements in or relating to the manufacture of hollow metal rods, bars, wires andthe like
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GB261107A
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Improvements in or relating to the manufacture of hollow metal rods, bars and the like
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US1572805A
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Rotary furnace
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GB177872A
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Improvements in or relating to the manufacture of hollow metal rods, bars, wires and the like
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GB147368A
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Improvements in or relating to the manufacture of hollow metal rods or bars
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GB141856A
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Improvements in or relating to internal combustion engines
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CA277591A
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Rotary furnace
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CA320032A
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Heat-treating apparatus
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