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US Patent: 911,809
Art of Grinding Ground Glass Bottle Necks and Stoppers Therefor
Patentee:
Conrad M. Conradson (exact or similar names) - Madison, Dane County, WI

USPTO Classifications:
451/114, 451/41, 65/61

Tool Categories:

Assignees:
Precision Glass Grinding Machine Co. - Sioux Falls, Minnehaha County, SD

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Jul. 25, 1907
Granted: Feb. 09, 1909

Patent Pictures:
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