(under the class definition) Apparatus comprising a spring biased member having cooperative intermeshing engagement between the working member or a member moved thereby and a relatively movable element, the intermeshing engagement being such that relative movement between the working member or the member moved thereby and the relatively movable element effects disengagement of the spring biased member from cooperative intermeshing engagement.
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15+, for a resiliently biased latching means for a working member which latching means must be released before movement of the working member can occur.