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 Aztecs / Mexicas were the native American people who dominated northern Mexico at the time of the Spanish conquest led by Hernan CORTES in the early 16th century.According to their own legends, they originated from a place called Aztlan, somewhere in north or northwest Mexico.he Aztecs / Mexicas were the native American people who dominated northern Mexico at the time of the Spanish conquest led by Hernan CORTES in the early 16th century.