An integrated prepaid cellular service and telephone unit including a cellular transceiver, a storage unit, a processor; and a creditdebit card interface. Filter arrangements may take the form of tubular, radially sealing elements; tubular, axial sealing elements; forward flow air cleaners; reverse flow air cleaners; and panel filters and can have multiple layers of fine fiber containing pleated media. The superstructure includes cutter bar receiving structure adapted to be grippingly engaged by a cutter bar having a cutting blade portion. The two adjacent first sensing pads are electrically disconnected from each other, and the two adjacent second sensing pads are electrically disconnected from each other.