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DE1954013A1
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Plastic-coated concrete units with smooth - weather proof surface
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GB1280188A
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A combination lock
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DE1933421A1
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Fired porous clay building elements
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GB1279980A
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Method for the manufacture of building units of fired, bloated clay
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GB1212694A
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A method of treating an article of a plastics material to render its surface anti-bacterial
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CA881836A
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Method for the manufacture of building units of burned expanded clay
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CA835064A
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Device for the determination of distribution factors
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CA804452A
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Centrifuge for complete phase separation of two liquids
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