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The collection I built isn’t large, but all calculators were fully operational at some point and that’s the way I would like to keep them. Some machines which have been repaired several years ago get blocked again and need some further cleaning and lubrication to remain operational.
The electronic calculators provided with rechargeable batteries are checked every few months. They are all equipped with modern low self-discharging batteries. An occasional recharge is sufficient to keep them operational.
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