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.
Early Mesoamerica. The peoples of Mesoamerica were two types of people: the Toltec (which means craftsman), who kept the urban culture, and the Chichimec, or wild people, who came to Mesoamerica from the north. The Mexica were first Chichimec when they migrated into Mexico, but then became Toltecs.