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US Patent: 1,709,233
Mechanical movement
Patentee: Oscar Christian Schroeder (exact or similar names) - Chicago, IL USPTO Classifications: 235/61L, 475/218, 74/348 Tool Categories: metalworking machines : metal lathes : metal lathe accessories and attachments Assignees: Oscar Christian Schroeder - Chicago, IL Hardinge Brothers, Inc. - Chicago, IL Manufacturer: Hardinge Brothers - Chicago, IL Witnesses: Unknown	Patent Dates: Applied: Jun. 18, 1920 Granted: Apr. 16, 1929 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Hardinge Brothers
Description: Quick-change threading box.

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