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| Patents Granted on 1988-12-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,791,834 | Dec. 20, 1988 | G.J. Federighi | Pressure metering cork extractor | non worm cork extractors | |
| 4,792,267 | Dec. 20, 1988 | R.J. Warner | Carriage for Machine Tool | metalworking machine mechanisms | |