SEISMIC METHODS 935 



2.306.224 M. Artzt. 



2,306,456-8 Issued Dec. 29, 1942. W. H. Mayne. "Measuring and Recording Apparatus." 

 2,306,991 Issued Dec. 29, 1942. G. M. Groenendyke. "Automatic Volume Control." 



2.307.790 Issued Jan. 12, 1943. H. Hoover, Jr. "Automatic Amplitude Control 

 System." 



2.307.791 Issued Jan. 12, 1943. H. Hoover, Jr. "Seismic Exploration System." 



2.307.792 Issued Jan. 12, 1943. H. Hoover, Jr. "Seismometer." 



2,309,560 Issued Jan. 26, 1943. W. R. Welty. "Method and Apparatus for Meas- 

 uring and Recording Vibrational Effects." 



2,309,817 Issued Feb. 2, 1943. L. F. Athy and E. V. McColIum. "Method of Making 

 Geophysical Explorations." 



2.311.079 Issued Feb. 16, 1943. J. O. Parr, Jr. "Transducer." 



2,312,642 Issued March 2, 1943. A. J. Herzenberg. "Seismic Exploration Method." 

 2,312,934 Issued March 2, 1943. E. M. Shook. "Gain Control for Seismograph 



Amplifiers." 

 2,313,091 Issued March 9, 1943. D. S. Reener. "Seismic Recording." 

 2,316,354 Issued April 13, 1943. B. E. Moritz, Jr. "Gain Control." 

 2,317,334 Issued April 20, 1943. E. J. Shimek. "Master Control for Electric 



Seismographs." 

 2,318,248 Issued May 4, 1943. J. P. Minton. "Phase Meter." 

 2,318,624 Issued May 11, 1943. O. S. Petty and J. O. Parr, Jr. "Automatic Volume 



Control for Recorder Amplifiers." 

 2,318,795 Issued May 11, 1943. L. J. Peters. "Seismograph Amplifier System." 

 2,319,626 Issued May 18, 1943. L. C. Paslay. "Signal Controlled Amplifier." 

 2,321,341 Issued June 8, 1943. B. B. Weatherby and W. T. Born. "Seismic Surveying." 

 2,321,450 Issued June 8, 1943. L. F. Athy and E. V. McCollum. "Seismic Surveying." 

 2,323,211 Issued June 29, 1943. F. J. Faltico. "Method and Apparatus for Automatic 



Gain Control." 

 2,324,816 Issued July 20, 1943. W. T. Born. "Seismic Surveying." 

 2,325,199 Issued July 27, 1943. J. P. Woods. "Method and Apparatus for Seismic 



Exploration." 

 2,328,222 Issued Aug. 31, 1943. M. D. McCarty. "Geophone." 

 2,329,558 Issued Sept. 14, 1943. S. A. Scherbatskoy. "Automatic Volume Control." 

 2,329,570 Issued Sept. 14, 1943. R. Wellenstein, W. Holle and M. Schumacher. 



"Device for Regulating the Sensitivity of Signal Receiving Apparatus." 

 2,329,721 Issued Sept. 21, 1943. H. Hoover, Jr., C. G. Morgan and N. J. Christie. 



"Geophysical Exploration System." 

 2,330,216 Issued Sept. 28, 1943. H. Hoover, Jr. and M. Swan. "Apparatus for 



Seismic Prospecting." 



2.331.080 Issued Oct. 5, 1943r'o. S. Petty. "Method of Seismic Reflection Surveying." 

 2,331,363 Issued Oct. 12, 1943. H. W. Washburn. "Seismic Prospecting System." 

 2,331,624 Issued Oct. 12, 1943. J. O. Parr, Jr. "Method of and Apparatus for 



Seismic Surveying." 

 2,331,904 Issued Oct. 19, 1943. G. V. A. Gustafsson and J. D. Malmqvist. "Geo- 

 physical Instrument." 

 2,332,536 Issued Oct. 26, 1943. K. H. F. Schlegel. "Electrical Circuit Control Device." 

 2,336,198 Issued Dec. 7, 1943. C. C. Stotz. "Apparatus for Seismic Prospecting." 

 2,336,206 Issued Dec. 7, 1943. J. P. Woods. "Seismograph Amplitude Control." 

 2,345,288 Issued March 27, 1944. W. E. Pugh. "Method of Seismic Prospecting." 

 2,346,369 J. D. Eisler. 



2,347,702 Issued May 2, 1944. H. B. Maris. "Device for Measuring Extremely Small 

 Angles." 



2.348.225 Issued May 9, 1944. O. S. Petty. "Magnetic Seismometer." 



2,348,401 Issued May 9, 1944. L. Manzanera. "Apparatus for Recording Wave Form 



Signals." 

 2,348,409 Issued May 9, 1944. J. O. Parr, Jr. "Seismic Surveying." 

 2,348,411 Issued May 9, 1944. O. S. Petty. "Method for Correlating Seismographic 



Curves." 

 2,349,186 Issued May 16, 1944. E. Merten, "Sensitivity Control for Seismic Re- 

 cording." 

 2,350,803 Issued June 6, 1944. R. D. Newcomb. "Automatic Volume Control." 

 2,351,456 Issued June 13, 1944. N. H. Ricker. "Seismic Surveying." 

 2,352,494 Issued June 27, 1944. J. O. Parr, Jr. "Seismic Surveying." 



