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ES273728A1
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Improvements in assemblies for channeling elements (Machine-translation by Google Translate, not legally binding)
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ES273699A1
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Improvements in assemblies between channeling elements (Machine-translation by Google Translate, not legally binding)
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ES261816A1
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Improvements in the molds for precomprimid concrete tubes (Machine-translation by Google Translate, not legally binding)
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ES251580A1
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Perfected pressure regulator (Machine-translation by Google Translate, not legally binding)
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ES251540A1
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Improvements in quick connections for channeling elements (Machine-translation by Google Translate, not legally binding)
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ES248425A1
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Pressure and/or expense regulator (Machine-translation by Google Translate, not legally binding)
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ES239879A1
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Waterproof washer for pipe joint (Machine-translation by Google Translate, not legally binding)
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ES209027A1
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A perfect machine to manufacture concrete pipes by centrifugation (Machine-translation by Google Translate, not legally binding)
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ES208677A1
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Machine for the realization of an armor in a tube or other similar piece (Machine-translation by Google Translate, not legally binding)
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ES203887A1
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New joint system for concrete pipes (Machine-translation by Google Translate, not legally binding)
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