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On models that do not have every day indicated, 5- or 10-day periods are shown and the exact date may be obtained by turning the star wheel one point for each day from the known data points. Spring-driven mechanisms may gain or lose time because of temperature variations. Synchronous motor-driven clocks will lose time if there is an interruption to service. They should be checked monthly and reset and adjusted if necessary. The contacts should be checked about once a year. On clocks having contacts on the back of the panel, disconnect the 120-volt wires from the terminal
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