| 摘要 |
889,492. Self-tapping screws; making screw fasteners. GENERAL AMERICAN TRANSPORTATION CORPORATION. July 21, 1960, No. 25474/60. Addition to 853,002. Classes 83 (2) and 83 (3). [Also in Group XXV] The screw 10 of the parent Specification is included in a fastener comprising stacked sheets 31, 32. |
