Assertion: brood's cell | /r/HasProperty | required for rotary extraction
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Source sentences:
text: Top-bar hive comb can be extracted by flinging motion e.g. in a hobbyist or commercial rotary extractor, but it can be problematic, because (a) if no foundation was used, the comb will break more easily during rotary movement, (b) top-bar hives combs have irregular or non-standard sizes that do not fit into commercially available extractors, (c) if the comb is not uniformly flat, it may be difficult to uncap the cells, which is required for rotary extraction and (d) not all rotary extractors have cages or mesh to prevent loose pieces of comb from falling into the drum.