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US Patent: 205,519
Improvement in File Guards
Coin Mint File Guard
Patentee:
Mary P. Ayers (exact or similar names) - San Francisco, CA

USPTO Classifications:
206/349, 407/29.15

Tool Categories:
industrial tools : tool holders
metalworking tools : files

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. V. Joice
R. G. Sneath

Patent Dates:
Applied: May 28, 1878
Granted: Jul. 02, 1878

Patent Pictures:
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Report data errors or omissions to steward Russ Allen.
Description:
Two halves cover all but a narrow portion of the file to allow personnel working in coin mints to file coin blanks to a uniform weight without risk of their fingers touching the file.

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