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2. Nero Marquina marble - Wikipedia

   en.wikipedia.org/wiki/Nero_Marquina_Marble

   Nero Marquina. Nero Marquina marble (mármol Negro Marquina [1]) is a high quality, black bituminous limestone extracted from the region of Markina, Basque Country in northern Spain. [2] This variety of natural stone gets its black color from naturally-occurring bitumen. [3] It is one of the most important "marbles" from Spain.

3. Carrara marble - Wikipedia

   en.wikipedia.org/wiki/Carrara_marble

   Carrara marble has been used since the time of Ancient Rome, when it was called marmor lunense, or "Luni marble". [2] [3]In the Middle Ages, most of the quarries were owned by the Marquis Malaspina who in turn rented them to families of Carrara masters who managed both the extraction and transport of the precious material.

4. Hollow-core slab - Wikipedia

   en.wikipedia.org/wiki/Hollow-core_slab

   The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3–3/4 the thickness of the slab. This makes the slab much lighter than a massive solid concrete floor slab of equal thickness or strength. The reduced weight also lowers material and transportation costs.

5. Baths of Nero - Wikipedia

   en.wikipedia.org/wiki/Baths_of_Nero

   The Baths of Nero (Thermae Neronis) or Baths of Alexander (Thermae Alexandrinae) were a complex of ancient Roman baths on the Campus Martius in Rome, ...

6. Marquina non-drip oil bottle - Wikipedia

   en.wikipedia.org/wiki/Marquina_non-drip_oil_bottle

   The Marquina non-drip oil bottle or cruet (in Catalan: setrill antidegoteig de Marquina, in Spanish: aceitera antigoteo de Marquina) is a transparent and conical cruet designed to contain oil or vinegar without dripping or dirtying, and was designed by Rafael Marquina in 1961. The sales success of this model has led to countless plagiarisms of ...