The present invention is a compact personal digital assistant and cellular telephone with foldable dual-sided display. The display unit displays a list of print jobs. A horizontal support table liftably cantilevered on two upright support members is provided in the apparatus, and the transporting robot with the rotating arms is placed on the horizontal support table. System embodiments also include a system for descrambling scrambled electromagnetic signals, the systems comprising a second electronically reconfigurable electro-optical material configured to remove the two-dimensional speckled pattern from the beam revealing the one or more electromagnetic signals encoding the data. A lever is pivotally connected to a second end of the shaft for lifting the shaft and the slider to pull the snare of the snare drum. Hollow fillets can be provided at the acute angle corners of the trapezoid.