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| All Patents in class 407/31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,487,865 | Jan. 06, 1970 | F.F. Chapman, D. Hill | Cutter-head | cutterheads | |
| RE27,654 | Jun. 05, 1973 | F.F. Chapman, D. Hill | Cutter-head structure | cutterheads | |