(under the class definition) Apparatus comprising a member or element which is intended to be mutilated, torn, broken, melted or destroyed so that it can not be re-used, but must be replaced, while other members remain in a usable condition.
(1) Note. Patents in this subclass usually are of the type where an element fails on overspeed, to prevent destruction of the entire unit.
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173.4, and 174.4, for a bearing, seal, or liner member positioned between a portion of the runner* and a static part which bearing, seal, or liner is intended to be eroded, abraded or permanently deformed.
