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US Patent: 909,749
Adjustable Collapsing Tap
Patentees:
Frederick L. Brown (exact or similar names) - Scottdale, Westmoreland County, PA
Isaac William Sprink (exact or similar names) - Scottdale, Westmoreland County, PA

USPTO Classifications:
408/148, 408/158, 408/73

Tool Categories:
metalworking machines : drilling and boring : tapping heads and chucks

Assignees:
Crescent Mfg. Co. - Scottdale, Westmoreland County, PA

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Feb. 05, 1908
Granted: Jan. 12, 1909

Patent Pictures:
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