for boring deep holes; Trepanning, e.g. of gun or rifle barrels

Full Title

Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor > for boring deep holes; Trepanning, e.g. of gun or rifle barrels

Classification Context

Section:

PERFORMING OPERATIONS; TRANSPORTING

Class:

MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR

Subclass:

TURNING; BORING

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