1142 EXPLORATION GEOPHYSICS 



1,776,228 Issued Sept. 16, 1930. Roscoe A. Coflfman. "Starter." 



1,808,709 Issued June 2, 1931. Alfred E. Blake. "Apparatus for Metering Gaseous 



Fluids." 

 1,853,119 Issued April 12, 1932. Reginald A. Fessenden. "Method and Apparatus 



for Determining Distance by Echo." 

 1,858,931 Issued May 17, 1932. Charles L. Florisson and Paul Langevin. "Method 



& Apparatus for Sounding & for Locating Submarine Obstacles by Means 



of Ultra-audible Waves." 

 1,860,740 Issued May 31, 1932. Harvey C. Hayes. "Oscillograph." 

 1,889,614 Issued Nov. 29, 1932. C. W. Rice. "Sound Wave Apparatus." 

 1,890,786 Issued Dec. 13, 1932. William S. Johnston. "Radio Distance or Location 



Finder." 

 1,900,015 Issued Mar. 7, 1933. Harvey C. Hayes. "Method and Apparatus for 



Sound Ranging." 

 1,923,088 Issued Aug. 22, 1933. Harvey C. Hayes. "Vibration Detector." 

 1,946,309 Issued Feb. 6, 1934. Roscoe A. Cofifman. "Motor." 

 2,005,913 Issued June 25, 1935. Roscoe A. Coflfman. "Motor and Motive System." 



2.009.459 Issued July 30, 1935. Edwin E. Turner, Jr. "Distance and Depth Finding." 



2.009.460 Issued July 30, 1935. Edwin E. Turner, Jr. "Means for Measuring Depths 

 or Distances." 



2,015,702 Issued Oct. 1, 1935. Robert Longfellow Williams. "Method and Apparatus 



for Measuring Distances and Depths." 

 2,033,160 Issued Mar. 10, 1936. Edwin E. Turner, Jr. "Method and Apparatus 



for Measuring Depths." 

 2,040,850 Issued May 19, 1936. Beverly R. Hubbard. "Method and Apparatus for 



the Determination of Direction of a Source of Wave Energy." 

 2,044,820 Issued June 23, 1936. Edwin E. Turner, Jr. "Apparatus for Measuring 



Depths." 

 2,047,974 Issued July 21, 1936. Paul E. Lehr and Harold T. Wyatt. "Method and 



Apparatus for Measuring Well Depths." 

 2,096,017 Issued Oct. 19, 1937. R. L. Williams. "Depth Sounding Apparatus." 

 2,134,428 Issued Oct. 25, 1938. Serge A. Scherbatskoy and Jacob Neufeld. 



"Apparatus for Exploring the Level of Liquid in a Bore Hole." 

 2,232,476 Issued Feb. 18, 1941. O. F. Ritzmann. "Method of and Apparatus for 



Measuring Depths in Wells." 

 2,281,301 Issued April 28, 1942. C. P. Walker. "Means for Determining the Location 



of Obstructions in Wells." 

 2,310,559 Issued Feb. 9, 1943. C. P. Walker. "Vibration Translating Means." 

 2,324,340 Issued July 13, 1943. C. P. Walker and E. E. Simmons. "Detector for 



Pressure Wave Translation Systems." 

 2,403,535 July 9, 1946. J. T. Kremer. "Well Sounding Microphone." 



