936 EXPLORATION GEOPHYSICS 



2,352,869 Issued July 4, 1944. J. F. Tolk. "Seismic Surveying." 



2,354,420 Issued July 11, 1944. J. P. Minton. "Contractor - Expander for Electric 



Seismographs." 

 2,354,548 Issued July 25, 1944. N. H. Ricker. "Seismic Prospecting." 

 2,354,659 W. O. Bazhaw and J. O. Parr, Jr. 

 2,355,826 J. A. Sharpe. 

 2,360,507 Issued Oct. 17, 1944. J. P. Minton. "Apparatus for Recording Seismic 



Waves." 

 2,361,648 Issued Oct. 31, 1944. O. S. Petty. "Seismic Surveying." 

 2,363,985 Issued Nov. 28, 1944. W. Moser. "Automatic Volume Control Device." 

 2,364,655 Issued Dec. 12, 1944. H. H. Pratley. "Geophysical Exploration." 

 2,364,755 Issued Dec. 12, 1944. O. F. Ritzmann. "Apparatus for Seismograph 



Prospecting." 

 2,365,289 Issued Dec. 19, 1944. O. S. Petty. "Seismic Surveying." 

 2,366,043 Issued Dec. 26, 1944. W. D. Mounce. "Automatic Gain Adjusting Device 



for Reflection Seismographs." 

 2,367,049 Issued Jan. 19, 1945. O. S. Petty. "Automatic Volume Control for 



Recorder Amplifiers." 

 2,370,483 Issued Feb. 27, 1945. G. Muffly. "Amplifier." 

 2,372,056 Issued March 20, 1945. R. A. Eroding. "Method and Apparatus for 



Recording Seismic Waves." 

 2,373,180 Issued April 10, 1945. F. J. Faltico. "Automatic Volume Control Circuit." 

 2,374,204 Issued April 24, 1945. H. Hoover, Jr. "Apparatus for Recording Seismic 



Waves." 

 2,375,283 Issued May 8, 1945. R. T. Cloud. "Amplification Control in Seismic 



Surveying." 

 2,375,433 Issued May 8, 1945. J. P. Minton. "Seismograph." 



2.375.570 Issued May 8, 1945. E. McDermott. "Seismic Detector System." 

 2,376,195 Issued May 15, 1945. S. A. Scherbatskoy. "Amplifying Apparatus." 

 2,378,925 Issued June 26, 1945. E. E. Hoskins and R. M. Moore. "Seismic Pros- 

 pecting System." 



2.383.571 Issued Aug. 28, 1945. E. M. Shook. "Gain Control for Seismograph 

 Amplifiers." 



2,383,855 Issued Aug. 28, 1945. C. W. Hansell. "Potential Ratio-Controlled Amplifier." 

 2,384,393 Issued Sept. 4, 1945. J. O. Parr, Jr. "Stabilizer for Automatic Volume 



Control Circuits." 

 2,384,529 Issued Sept. 11, 1945. V. W. Breitenstein. "Magnetic Instrument." 

 2,387,845 Issued Oct. 30, 1945. W. R. Harry. "Electroacoustic Transducer." 

 2,388,303 Issued Nov. 6, 1945. H. M. Wise. "Elastic Measuring Scale." 

 2,388,703 Issued Nov. 13, 1945. R. A. Peterson. "Geological Prospecting System." 

 2,388,848 Issued Nov. 13, 1945. W. C. Howe. "Magnetic Shielding for Transformers 



and the Like." 

 2,390,187 Issued Dec. 4, 1945. J. A. Sharpe. "Seismic Surveying." 

 2,390,322 Issued Dec. 4, 1945. J. O. Parr, Jr. "Seismic Surveying." 

 2,390,328 Issued Dec. 4, 1945. R. J. Roberts. "Directional Seismograph Pickup." 

 2,392,758 Issued Jan. 1, 1946. J. P. Minton and R. A. Broding. "Method and Appa- 

 ratus for Recording Seismic Waves." 

 2,394,990 Issued Feb. 12, 1946. J. D. Eisler and J. A. Sharpe. "Recording System in 



Seismic Surveying." 

 2,395,289 Issued Feb. 19, 1946. J. Neufeld. "Method and Apparatus for Seismic Pros- 

 pecting." 

 2,395,427 Issued Feb. 26, 1946. O. S. Petty. "Seismic Prospecting." 

 2,395,481 Issued Feb. 26, 1946. H. Hoover, Jr. "Seismic Exploration System." 

 2,396,691 Issued March 19, 1946. R. R. Galbreath. "Condenser Transmitter - Amplifier 



System." 

 2,400,245 Issued May 14, 1946. W. H. Mayne. "Seismic Surveying." 

 2,400,522 Issued May 21, 1946. H. Hoover, Jr. "Range Finder." 

 2,401,411 Issued June 4, 1946. S. F. Carlisle, Jr. and A. B. Mundel. "Frequency 



Response Testing System." 

 2,403,974 Issued July 16, 1946. W. D. Goodale, Jr., B. F. Lewis and W. H. Martin. 



"System for Locating the Source of an Explosion Wave." 

 2,404,391 Issued July 23, 1946. W. P. Mason. "Prismatic and High Power Com- 

 pressional-Wave Radiator and Receiver." 



