| 摘要 |
1,069,530. Automatic exchange systems. REDDIFITTERS Ltd. Dec. 10, 1965 [Dec. 21, 1964], No. 51925/64. Heading H4K. In a line finder arrangement, when a line 1, 2 is looped the current flow through resistors R 1 , R 2 , R 3 changes the potential at point 4 and allows current to flow through diode 5 to activate a transistor T1 and energize start relay ST. An allotted finder rotates until the calling line is reached whereupon current flows through a diode 13 similar to 5, a transistor T2 conducts and relay A energizes to stop the finder and to advance the allotter 9. |
