(under subclass 64) Traps having an entrance so made that once the animal is inside he finds it impossible to return by that entrance, whether through physical impossibility or because of some peculiarity of habit or the like. Tilting trap-doors are not regarded as entrances.
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100+, and particularly subclasses 101, 103, and 105, for fish traps adapted to be set in water, which are generally characterized by such entrances.
