| 摘要 |
<p>747,010. Automatic exchange systems. BRITISH TELECOMMUNICATIONS RESEARCH, Ltd. May 21, 1953 [May 27, 1952], No. 19451/55. Divided out of 746,942. Drawings to Specification. Class 40 (4). Information for the selective operation of switches is registered on a magnetic drum to produce subsequently a marking in a position characteristic of the switch which is to be operated. The description is identical with that of Specification 746,942 but the claims differ. Specifications 717,687 and 717,689 also are referred to.</p> |
