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US Patent: 643,083
Thrust Register for Drilling Machines
Patentees: Mary Ann Bullock, Executrix (exact or similar names) - Chicago, Cook County, IL Milan C. Bullock, deceased (Estate of) (exact or similar names) - Chicago, Cook County, IL USPTO Classifications: 173/145, 173/197, 173/20, 175/121, 175/203, 175/216, 175/50 Tool Categories: metalworking machines : drilling and boring : drill presses : drill press accessories Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Apr. 17, 1899 Granted: Feb. 06, 1900 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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