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US Patent: 2,474,500
High-low speed attachment for drill presses
Patentee: Frederick Kenneth Stein (exact or similar names) - Rockford, IL USPTO Classifications: 123/198D, 474/79, 474/89 Tool Categories: industrial machines : industrial machine mechanisms : industrial machine pulleys and belt drive mechanisms Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jan. 07, 1948 Granted: Jun. 28, 1949 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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