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Patent Known References
| Type | Patent Country | Patent Number |
|---|---|---|
| Patent | US | 4254506 |
| Patent | US | 4367558 |
| Patent | US | 4422096 |
| Patent | US | 4425578 |
| Patent | US | 4499606 |
| Patent | US | 4763195 |
| Patent | US | 4897727 |
| Patent | US | 4939789 |
| Patent | US | 5182646 |
| Patent | US | 5315392 |
| Patent | US | 5771080 |
| Patent | US | 5995563 |
| Patent | US | 6115074 |
| Patent | US | 6118498 |
| Patent | US | 6124898 |
| Patent | US | 6137546 |
| Patent | US | 6188448 |
| Patent | US | 6212680 |
| Patent | US | 6337719 |
| Patent | US | 6405372 |
| Patent | US | 6421099 |
| Patent | US | 6442757 |
| Patent | US | 6445425 |
| Patent | US | 6483547 |
| Patent | US | 6486925 |
| Patent | US | 6538704 |
