| 摘要 |
A hand-held calculating device for calculating Federal Income Taxes or the like includes substantially flat, elongate front and rear cover members and an insert card. Suitable structure is provided for joining the cover members with the card slidably insertable therebetween. The card bears a plurality of columns on both front and rear sides thereof, each column bearing a plurality of lines of tax figures or the like. A number of through apertures or windows are provided on both front and rear cover members for viewing selected lines and columns of figures on the insert card.
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