Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853575 | Tachometer generator | — | 1989-08-01 |
| 4841594 | Cordless vacuum cleaner with power brush | Donald E. Elson, Burton E. Gerke, Jr., Michael E. Bitzel, Bruce A. Wilder, Stanley J. Rodowsky, Jr. +2 more | 1989-06-27 |