US Patent: 205,519
|
Improvement in File Guards
Coin Mint File Guard
|
|
Patentee:
|
|
| Mary P. Ayers (exact or similar names) - San Francisco, CA |
| Manufacturer: |
| Not known to have been produced |
|
|
Patent Dates:
|
| Applied: |
May 28, 1878 |
| Granted: |
Jul. 02, 1878 |
USPTO (New site tip)
Google Patents
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. |
|
