| 摘要 |
558,940. Card indexes. COPELANDCHATTERSON CO., Ltd., and ELSDEN, H. E. Dec. 8, 1942, No. 17448. [Class 146 (i)] In indicator-cards for card indexes of the kind which are held in laterally overlapping relation by means of spaced recesses a, b in their edges the series of recesses are placed nearer to one edge of the card than to the other, so that the amount of overlap can be reduced to one-half by the reversal of alternate cards about their vertical axes. |
