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 /ËaeztÉk/ ËÃ¦ztÉk people were certain ethnic groups of Central, mexico particularly those groups who spoke The nahuatl language and who dominated large parts Of mesoamerica from the 14th to 16th. centuries