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in line[′in ¦līn]
Over the center of a borehole and parallel with its long axis.
Of a drill motor, mounted so that its drive shaft and the drive rod in the drill swivel head are parallel, or mounted so that the shaft driving the drill-swivel-head bevel gear and the drill-motor drive shaft are centered in a direct line and parallel with each other.
Having similar units mounted together in a line.