crwdns2935425:04crwdne2935425:0
crwdns2931653:04crwdne2931653:0
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Pressed buttons for electrical connections on the the conductive traces.
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Circuit board for making basic calculations.
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1.5V battery
crwdns2944171:0crwdnd2944171:0crwdnd2944171:0crwdnd2944171:0crwdne2944171:0