Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875628 | Method and apparatus for crushing brittle material for grinding | Osbert R. Knobloch | 1989-10-24 |
| 4867879 | Pipeline sieve with a suction removal device | — | 1989-09-19 |
| 4847587 | Bimetal thermoswitch | — | 1989-07-11 |