Improvements introduced in a two-header boring machiner/miller. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in a boring / milling two heads, wherein the first head boring / milling mounted on a main shaft capable turn to move up / downward relative to the frame of the machine, and the second head boring / milling mounted on a mobile frame guided said main shaft to be axially sliding said regarding the first head boring / milling. (Machine-translation by Google Translate, not legally binding)