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12/1915
22,275. Wirtz, L. Nov. 10. Signals indicating proximity of land, vessels, and the like ; subaqueous sound signals ; recording signals ; locating subaqueous... 
TESTING | DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES | RADIO NAVIGATION | LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES | MEASURING | PHYSICS | RADIO DIRECTION-FINDING | ANALOGOUS ARRANGEMENTS USING OTHER WAVES
Patent
The Musical Quarterly, ISSN 0027-4631, 4/1918, Volume 4, Issue 2, pp. 250 - 267
Journal Article
06/1921
165,151. Mosley, F. E. March 10, 1920. Recording particular operations; photographic recorders. -In apparatus for producing a graphic record of the duration of... 
ELECTROGRAPHY | HOLOGRAPHY | APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES | APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM | ACCESSORIES THEREFOR | PHOTOGRAPHY | CINEMATOGRAPHY | PHYSICS
Patent
01/1922
161,988. Blondel, A. April 21, 1920, [Convention date]. Determining distances acoustically; sound, actuating apparatus by; detecting subaqueous sounds.-In... 
TESTING | DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES | RADIO NAVIGATION | LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES | MEASURING | PHYSICS | RADIO DIRECTION-FINDING | ANALOGOUS ARRANGEMENTS USING OTHER WAVES
Patent
05/1922
156,228. Mintrop, L. Aug. 6, 1917, [Convention date]. Photographic recorders; graduations of recordsurface; vibrations, indicating, dc.-A photographic... 
ELECTROGRAPHY | HOLOGRAPHY | APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES | APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM | ACCESSORIES THEREFOR | PHOTOGRAPHY | CINEMATOGRAPHY | PHYSICS
Patent
01/1923
189,816. Low, A. M. April 27, 1918. Sounds, measuring intensity of; recording signabs. - Sounds are directed by a cone b, Fig. 1, on to a diaphragm c and... 
TESTING | MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES | MEASURING | PHYSICS
Patent
03/1923
194,599. Schmidt, F. May 24, 1922. Determining bearings and distances accoustically; subaqueous audible signals; detecting subaqueous sounds.-Relates to... 
TESTING | DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES | RADIO NAVIGATION | LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES | MEASURING | PHYSICS | RADIO DIRECTION-FINDING | ANALOGOUS ARRANGEMENTS USING OTHER WAVES
Patent
04/1923
173,510. Blondel, A. Dec. 23, 1920, [Convention date]. Void [Published under Sect. 91 of the Act]. Directive signalling.-In wireless direction finding, whether... 
TESTING | DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES | RADIO NAVIGATION | LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES | MEASURING | PHYSICS | RADIO DIRECTION-FINDING | ANALOGOUS ARRANGEMENTS USING OTHER WAVES
Patent
08/1927
276,052. Round, H. J., and West, A. G. D. May 13, 1926. Systems for transmitting music &c. - Echo or reverberation effects are added in any desired degree to a... 
ACOUSTICS | METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL | ACOUSTICS NOT OTHERWISE PROVIDED FOR | MUSICAL INSTRUMENTS | PHYSICS | SOUND-PRODUCING DEVICES
Patent
12/1927
281,959. Beatty, W. E., (Bell Telephone Laboratories, Inc.). June 10,1927. Sound-recording apparatus associated with kinenatographs.-Relates to combined... 
ELECTROGRAPHY | HOLOGRAPHY | APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES | APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM | ACCESSORIES THEREFOR | PHOTOGRAPHY | CINEMATOGRAPHY | PHYSICS
Patent
01/1929
305,058. Linsell, A. A. Oct. 25, 1927. Phonographic recorders and reproducers; diaphragms; magnetic instruments. - The vibratory member of an acoustic... 
ACOUSTICS | METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL | ACOUSTICS NOT OTHERWISE PROVIDED FOR | MUSICAL INSTRUMENTS | PHYSICS | SOUND-PRODUCING DEVICES
Patent
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