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| All Patents in class 451/469 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,763,104 | Sep. 18, 1956 | E.R. Lindenborg | Flexible abrasive brush | sanding machines | |
| 3,116,576 | Jan. 07, 1964 | A. Block | Abrasive polisher | metal sanding machines | |
| 4,369,606 | Jan. 25, 1983 | R.E. Reiman | Abrasive head | ||