| http://www.w3.org/ns/prov#value | - When the level of material in the hopper diminishes to a predetermined amount (as may be monitored by a load level switch or optical sensor or the like), the switch or other actuator or the like may engage or actuate or trigger the bulkhead or push plate and/or the bag conveyor, which in turn functions to move or push the stacked bags back towards the hopper area.
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