| 摘要 |
<p>1,259,882. Wave-energy echo-ranging. FRIED KRUPP G.m.b.H. 22 July, 1969 [23 July, 1968], No. 36847/69. Heading H4D. In a radar or sonar cathode-ray tube 2 plan position indicator system a selectable range ring strobe is produced utilizing a clock pulse generator 7, a selector 9 and a pulse counter 8. Fixed range markers may also be produced via gates 15, 16, 17.</p> |
