Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5351161 | Variable scale rotary switch | Michael T. MacKay, Robert Duffy, William S. Herz, Joe McArdle | 1994-09-27 |
| 5187630 | Multi-parameter variable scale rotary switch | Michael T. MacKay, Robert Duffy, William S. Herz, Joe McArdle | 1993-02-16 |
| 4589608 | Cassette loading apparatus | George D. Rehklau, Robert Z. Langevin | 1986-05-20 |
| 4512527 | Cassette loading apparatus | George D. Rehklau, Robert Z. Langevin | 1985-04-23 |