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US Patent: 1,820,056
Boring Tool Holder
Patentee:
Irvin Drowns (exact or similar names) - Canton, Stark County, OH

USPTO Classifications:
408/72R, 82/157, 82/19

Tool Categories:
metalworking machines : drilling and boring : drilling and boring tool holders

Assignees:
Timken Roller Bearing Co. - Canton, Stark County, OH

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Mar. 19, 1928
Granted: Aug. 25, 1931

Patent Pictures:
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