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US Patent: 1,745,660
Expanding Arbor
Patentee:
William J. Denning (exact or similar names) - Chicago, Cook County, IL

USPTO Classifications:
269/52, 279/2.03, 279/2.12, 408/156, 408/171

Tool Categories:
metalworking machines : drilling and boring : drill bits : reamers

Assignees:
Conradson Tool Co. - Chicago, Cook County, IL

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Dec. 06, 1928
Granted: Feb. 04, 1930

Patent Pictures:
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