Abstract: A direct current (DC) traction power electric arc suppressing device is provided. The device comprises a parallel resistor-capacitor (RC) circuit electrically connected between a main traction power rail and an associated power rail incline end section with a narrow insulating joint installed between the main traction power rail and the associated power rail end section incline.

Abstract: A direct current (DC) traction power electric arc suppressing device is provided. The device comprises a parallel resistor-capacitor (RC) circuit electrically connected between a main traction power rail and an associated power rail incline end section with a narrow insulating joint installed between the main traction power rail and the associated power rail end section incline.

Abstract: The present invention refers to a type of acoustic and amplified Sound Box including a Portable sound device, an Acoustic box with a Flexible base and Perforated sound outlet, internally containing the operating devices such as a PCI amplifier board, a Power battery, Loudspeaker sound amplifiers, subwoofer, Audio input and output connectors as well as On/Off connector with LED light, as well as P10 Plug or similar installed on the lower part and Connector for smartphones such as Iphone or Ipod or similar and/or USB Connector, to be used in amplifying sound in string instruments or similar instruments in order to provide sound amplification from the musical instrument whose primary sound source is the vibration of the tensioned strings when plucked, struck or rubbed and, thereby providing greater surround sound and better quality, reaching a more distant audience and not only those close to the musician and his instrument.