Global time calculator includes an insert (insert) and the sleeve (sleeve). Inserts the specified time increment of the vertical column table is displayed on both sides, it may include a stop mechanism, or it may be. Insert is slidable so that it can be displaced in the vertical direction and is connected with the sleeve. Both sides (or one side of the sleeve in some embodiments) of the sleeve has an obscure vertically aligned time specified table exceeding the specified time tables that are not covered region.
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