| Number | Name | Date | Kind |
|---|---|---|---|
| 151635 | Uhlinger et al. | Jun 1874 | A |
| 2651230 | Waterval | Sep 1953 | A |
| 4646594 | Tien | Mar 1987 | A |
| 4774736 | Brawner et al. | Oct 1988 | A |
| 5048379 | Gramera et al. | Sep 1991 | A |
| 5186083 | Hsiao | Feb 1993 | A |
| 5219392 | Ruzicka et al. | Jun 1993 | A |
| 5595096 | Coffman | Jan 1997 | A |
| 6112625 | Turtle | Sep 2000 | A |
| Entry |
|---|
| Three (3) Product sheets published by Lowell Corporation at least as early as May 24, 2000. |