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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
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