公开(公告)号：GB750268A

公开(公告)日：1956-06-13

申请号：GB292054

申请日：1954-02-01

Applicant: IBM

Inventor： SCHEERER WALTER ,  RAECK FRITZ

Abstract: 750,268. Statistical apparatus. INTERNATIONAL BUSINESS MACHINES CORPORATION. Feb. 1, 1954, No. 2920/54. Class 106 (1). Apparatus for sensing electro-conductive marks on a record card comprises two brushes located directly one behind the other in line with the direction of the card column as shown in Fig. 4. The pair of brushes may be staggered slightly to accommodate marks made slightly oblique as shown in Fig. 3. An insulating spacer may be inserted between the brushes if required as shown in Fig. 5. The invention is stated to be an improvement on the prior use of three brushes as shown in Fig. 2 in that less width per column is required and the total data bearing area of the card may be correspondingly increased.