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Manufactured by IBM's International Time Recording Co. division in the 1930s, the daily attendance recorder came in three sizes — for 50, 100 and 150 employees — and with either a single or double drum. The double drum models had a capacity for two daily sheets which automatically positioned themselves for the current day's records. When one sheet was used, a new one moved into place and a new sheet could be substituted for the completed record at any time during the day. The single drum dial recorder required that the sheets be replaced after working time or before starting time in the morning. |
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