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| Patents Granted on 1981-06-02 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,270,275 | Jun. 02, 1981 | D.R. McMurtry | Probes | ||
| 4,270,743 | Jun. 02, 1981 | C.P. Crompton | Forward numbering or underlap sheet delivery | ||