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Lord Kelvin, British mathematician and physicist ; 1897
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| Number | Title | Issue Date |
| 6004582 | Multi-layered osmotic device The present invention provides a simple and improved multi-layered osmotic device (1) that is capable of delivering a first active agent in an outer lamina (2) to one environment of use and a second active agent in the core (5) to another environment of u... | 12/21/1999 |