| 摘要 |
993,432. Seismic prospecting. COMPAGNIE GENERALE DE GEOPHYSIQUE. Jan. 25, 1962 [Jan. 27, 1961], No. 3270/65. Divided out of 993,431. Drawings to Specification. Heading H4D. The description is identical to that of Specification 993,431, the claims being directed to the production of a record carrying a series of lines extending across a time axis each line corresponding to a particular reflecting layer the depth of which is indicated by its position along the time axis and the dip of which is indicated by the inclination of the line to the time axis. |
