Steel and elastomer assembly that has a central through-passage equal to or greater in diameter than the riser bore and that may be positioned in the riser string to reduce local bending stresses.
The Mazatec people are an indigenous people who inhabit an area known as the Sierra Mazateca in the state of Oaxaca in southern Mexico, as well as some communities in the adjacent states of Puebla and Veracruz.
The Mayan people did not disappear and continue to live in Mexico and Central America. The Aztecs. The Aztecs were a people who came into the Valley of Mexico in the 12th century and quickly rose to become the dominant power in Mesoamerica. The capital of the Aztecs, Tenochtitlan, was built on Lake Texcoco on raised islands. The Aztecs formed an empire commanding tribute from other city states in Mesoamerica.