| (subclass Month TimeInterval) | Merge.kif 9043-9043 | Month is a subclass of time interval |
| (subclass January Month) | Merge.kif 9048-9048 | January is a subclass of month |
| (subclass February Month) | Merge.kif 9062-9062 | February is a subclass of month |
| (subclass March Month) | Merge.kif 9086-9086 | March is a subclass of month |
| (subclass April Month) | Merge.kif 9100-9100 | April is a subclass of month |
| (subclass May Month) | Merge.kif 9114-9114 | May is a subclass of month |
| (subclass June Month) | Merge.kif 9128-9128 | June is a subclass of month |
| (subclass July Month) | Merge.kif 9142-9142 | July is a subclass of month |
| (subclass August Month) | Merge.kif 9156-9156 | August is a subclass of month |
| (subclass September Month) | Merge.kif 9170-9170 | September is a subclass of month |
| (subclass October Month) | Merge.kif 9185-9185 | October is a subclass of month |
| (subclass November Month) | Merge.kif 9199-9199 | November is a subclass of month |
| (subclass December Month) | Merge.kif 9213-9213 | December is a subclass of month |
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