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telephone × 251batteries × 17
audio × 16
communication × 16
telecommunications × 15
voltage × 11
power × 11
charger × 11
analog × 10
microphone × 9
cellphone × 9
signal × 8
charging × 8
modem × 8
arduino × 7
power-supply × 7
transformer × 7
dc × 7
operational-amplifier × 6
usb × 6
battery-charging × 6
wiring × 6
microcontroller × 5
raspberry-pi × 5
identification × 5