Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4309761 | Calculator for evaluating numerical answers to problems | William M. Kahn, David Shapiro | 1982-01-05 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4309761 | Calculator for evaluating numerical answers to problems | William M. Kahn, David Shapiro | 1982-01-05 |