| 摘要 |
823,553. Statistical record cards or tapes. INTERNATIONAL BUSINESS MACHINES CORPORATION. April 23, 1956 [April 21, 1955], No. 12300/56. Class 106 (1). [Also in Group VIII] Record cards or tapes for use in statistical machines are made from a layer of plastic backed on both sides with paper. The plastic is polyvinyl chloride and the backing paper is glued to it. The thickness of the plastic layer is about half that of the whole card or tape. The plastic or the backing or both may be transparent or translucent. |
