Letters Between the U.S. Copyright Office and Other Agencies
| May 4, 2021 | Letter from USCO to Food and Drug Administration re: Classes 9 and 12 |
| August 13, 2021 | Letter from Food and Drug Administration to USCO re: Classes 9 and 12 |
| May 4, 2021 | Letter from USCO to Food and Drug Administration re: Classes 9 and 12 |
| August 13, 2021 | Letter from Food and Drug Administration to USCO re: Classes 9 and 12 |