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A frame for inserting and/or removing circuit cards from the housing of a machine includes a circuit card carrier connected to a locking CAM slide that is disposed to move within the channel of an actuator bar. A slot with a locking feature is fabricated on the locking CAM slide. A pin extending fro

A frame for inserting and/or removing circuit cards from the housing of a machine includes a circuit card carrier connected to a locking CAM slide that is disposed to move within the channel of an actuator bar. A slot with a locking feature is fabricated on the locking CAM slide. A pin extending from a surface of the actuator bar into the channel coacts with the locking mechanism to lock the actuator bar relative to the locking CAM.

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1. A machine sub-assembly including:an actuator bar having members defining a substantially U-shaped channel with at least one protrusion extending from one of the members into the channel; a cam slide with a side portion on which a slot having an angled portion and at least a horizontal portion is

1. A machine sub-assembly including:an actuator bar having members defining a substantially U-shaped channel with at least one protrusion extending from one of the members into the channel; a cam slide with a side portion on which a slot having an angled portion and at least a horizontal portion is fabricated; a locking structure positioned within the slot; wherein said side portion of the cam slide is constrained to ride in the substantially U-shaped channel with the protrusion extending into the slot and being disposed to be placed in a first position to coact with the locking structure to prevent relative motion between the actuator bar and said cam slide or to be placed in an unlock position in which the actuator bar is free to move relative to the cam slide.