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US Patent: 914,244
Method of Making Interchangeable Ground Glass Bottle Necks and Ground Glass Stoppers Therefore
Patentee:
Conrad M. Conradson (exact or similar names) - Madison, Dane County, WI

USPTO Classifications:
451/41, 451/541

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: Jun. 13, 1902
Granted: Mar. 02, 1909

Patent Pictures:
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