How to make tiny drills quickly, easily & accurately /
Porter, Robert D.,
How to make tiny drills quickly, easily & accurately / by Robert D. Porter. - 16 pages : illustrations ; 21 cm
Clock and watch making--Equipment and supplies--Handbooks, manuals, etc.
Drilling and boring machinery--Handbooks, manuals, etc.
drill Porter, Robert tool Timekeeper (general)
How to make tiny drills quickly, easily & accurately / by Robert D. Porter. - 16 pages : illustrations ; 21 cm
Clock and watch making--Equipment and supplies--Handbooks, manuals, etc.
Drilling and boring machinery--Handbooks, manuals, etc.
drill Porter, Robert tool Timekeeper (general)