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 were a Mesoamerican people who lived in what is now Mexico City and the surrounding territory beginning in the 14th century.They established a broad empire that lasted roughly 200 years and which was based on tributes and military conquests.he Aztecs were a Mesoamerican people who lived in what is now Mexico City and the surrounding territory beginning in the 14th century.