Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5209400 | Portable calculator for refrigeration heating and air conditioning equipment service | John M. Winslow, Walter Rubinstein | 1993-05-11 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5209400 | Portable calculator for refrigeration heating and air conditioning equipment service | John M. Winslow, Walter Rubinstein | 1993-05-11 |