Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4921270 | Convertible hand truck | — | 1990-05-01 |
| 4893824 | Hand truck for file cabinets | John E. Turek | 1990-01-16 |
| 4790434 | Data cartridge storage and handling system | Daniel Charles Johnson | 1988-12-13 |
| 4770383 | Multi-purpose open top support base | Marcus S. Lehman | 1988-09-13 |
| 4756429 | Carousel data holder | Marcus S. Lehman, Daniel Charles Johnson | 1988-07-12 |