ffens the shank of the drill, leaving exposed a length only sufficient for the depth of the hole to be drilled. The "CENTRAL" Drill Protector. Saves money. Lengthens the life of the small drills ; they may be resharpened until too short to use. It pays fcr itself, after the first few holes have… … m'Winini'iirr KINDLY MENTION " THE AEROPLANE " WHEN CORRESPONDING WITH ADVERTISERS
Aeronautics -- Periodicals
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
