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Adding calculator machine multiple buttons being depressed
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Fan with pull cord starts ands stops
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Adding calculator machine paper till roll tearing off
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Adding calculator machine paper till roll printing
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Typing on a manual calculator with printing. Vintage recording.
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Adding machine electric. Vintage recording.
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Quick ascending sequence of fast medium pitched beeps
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Sliding a plastic calculator cover
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Pressing a calculator button
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Smooth and rapidly pulsing synth tone