permissible machine

permissible machine

[pər′mis·ə·bəl mə′shēn]
(mining engineering)
A machine, such as a drill, mining machine, loading machine, conveyor, or locomotive, that meets the standards of the U.S. Bureau of Mines.
References in periodicals archive ?
The hydraulic pressure will usually be "maxed-out" - that is, up against the permissible machine pressure settings - while the screw is trying to break through the frozen nozzle.