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| Number | Title | Issue Date |
| 6021180 | Processing of telecommunications transmissions and directing consumers to need providers A processor responds to first and second specific sequences of data by providing the same first expression. The first and second specific sequences of data are derived from sequences of telephone digits which are typed in by a telephone caller. The first ... | 02/01/2000 |
| 5389934 | Portable locating system A portable tracking system that includes one or more portable units for determining their respective locations and communicating it to another unit or to a remote telephone unit. Each unit includes a global positioning system GPS for determining latitude ... | 02/14/1995 |
