Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D299935 | Mobile element | D. Michael Williams, David Schweitzer, John Piszko, George Lopac | 1989-02-21 |
| D299936 | Support for toy mobile | D. Michael Williams, David Schweitzer, John Piszko, George Lopac | 1989-02-21 |