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51 Button and Switches -
52 battery -
53 cables
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54 capacitors -
55 Connectors -
56 Data Loggers
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5A LCD and LEDS -
5B LEDs and illumination -
5C logic
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5D Magnets -
5E Memory and Cards -
5F Oscillators
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5G Potentiometer -
5H power -
5I Resistors
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5J RTC (Real Time Clock) -
5K Transistors -
5L Lasers