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5-20 minuts timer circuit using IC 555 - ElecCircuit.com
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Amazon.com: TimeCube Plus Preset Timer with 4 LED Light Alarm for Time Management, and Countdown Settings (Red - 5,10,20,25 min) : Home & Kitchen
Amazon.com: 30 Minute Timer
58 Minute Timer | 25 minute timer, 20 minute timer, 15 minute timer
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