Communications: electrical – Selective – Having electron beam device
Patent
1974-03-18
1976-02-10
Hubler, Malcolm F.
Communications: electrical
Selective
Having electron beam device
181108, 181401, 340 10, 340 17R, 73 672, 73 678R, G01V 100
Patent
active
039380726
ABSTRACT:
A sonic generator sends a collimated acoustical wave into the section of earth under test and resonance conditions are established depending upon the nature and depth of discontinuities in the path of the acoustical wave. These resonance conditions are monitored by observing and recording electrical relationship in the power supply section of the sonic generator.
REFERENCES:
patent: 2431233 (1947-11-01), Erwin
patent: 2538114 (1951-01-01), Mason
patent: 2693106 (1954-11-01), Henry
patent: 3593257 (1971-07-01), Massa, Jr.
patent: 3716828 (1973-02-01), Massa
Baird Charles
Plum William B.
Autrey Evert A.
Birmiel H. A.
Hubler Malcolm F.
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