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 Aztec. The last of the great MesoAmerican cultures were the Aztec, they were a Nahuatl-speaking people, who in the 15th and early 16th centuries, ruled a large empire in what is now central and southern Mexico.hen there were the Toltecs, who dominated much of central Mexico around 1200 A.D. Their language âNahuatlâ, was also spoken by the Aztecs. They were a militaristic nomadic people, and they or their ancestors may have sacked the city of Teotihuacan in 750 A.D.