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US Patent: 1,443,687
Self Opening Tool Holder
Patentee:
William Hughes (exact or similar names) - Philadelphia, PA

USPTO Classifications:
409/346, 82/158

Tool Categories:
metalworking machines : metalworking machine tool holders

Assignees:
Hess-Bright Mfg. Co. - Philadelphia, PA

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Dec. 22, 1920
Granted: Jan. 30, 1923

Patent Pictures:
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