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ES138239A1
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A procedure for manufacturing objects made of plastic materials.
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ES112221A1
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A procedure for the refining of lubricating oils that have been used.
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CA326310A
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Container sealing device
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CA328411A
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Olefin polysulphide plastic
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CA336726A
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Methylene polysulphide plastic
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CA350820A
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Impregnated material
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CA329564A
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Storage tank sealing device
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CA299879A
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Process of refining used oil
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CA336070A
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Methylene polysulphide plastic
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CA317167A
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Electrical conductor
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CA361217A
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Plastic, elastic and flexible substance
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