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US Patent: 13,998
Extension-Bit
Patentee:
John P. Rollins (exact or similar names) - Boston, MA

USPTO Classifications:
408/183

Tool Categories:
woodworking tools : hand drills : drill bits : adjustable drill bits

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Lalen Coffin
Maynard Twitchle

Patent Dates:
Granted: Dec. 25, 1855

Patent Pictures:
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