Diodes; Semi-conductors; Carrying cases, holders, protective cases and stands featuring power supply connectors, adaptors, speakers and battery charging devices, specially adapted for use with handheld digital electronic devices, namely, cell phones, MP3 players, personal digital assistants; Components for electrical mains in the nature of electric wires, connectors, circuit breakers, cables; Educational apparatus, namely, manipulative blocks used as teaching aids for the visualization of mat...