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.
More about Aztecs. The people from Aztec were from certain ethnic groups of central Mexico, especially the groups who spoke the Nahuatl language who dominated large portions of Mesoamerica in the 14th, 15th and 16th centuries.ztecs and Incas are two of the great civilizations of South America. Though, both these civilizations are Pre-European in their origin, it is the Native American people who have marvelous accomplishments in the history. Both of the civilizations have got their differences as they have evolved differently.