Communications: electrical – Selective – Having electron beam device
Patent
1975-10-09
1978-01-03
Birmiel, Howard A.
Communications: electrical
Selective
Having electron beam device
340 155DS, 340261, 299 1, 299 12, 340 15, G01V 116, G01V 122
Patent
active
040669920
ABSTRACT:
A surveillance system for maintaining continuous vigil as to seismic energy generating disturbances in and around an underground mine, such system being one of permanent installation which in combination with central data processing apparatus provides a continuous data output indication of certain mine activities. The system utilizes a plurality of permanently installed, underground geophone sensors each in communication via particular ACC circuitry and signal processing circuitry to provide input through an interface logic network to a central computer equipment programmed to determine disturbance locations, certain intensities, time duration and the like.
REFERENCES:
patent: 3552520 (1971-01-01), Nauerbeit
patent: 3564493 (1971-02-01), Hicklin
patent: 3569923 (1971-03-01), Nauerbeit et al.
patent: 3714622 (1973-01-01), Wilhelmsen
patent: 3717864 (1973-02-01), Cook
patent: 3824532 (1974-07-01), Vandierendonck
patent: 3879720 (1975-04-01), Dusheck, Jr.
patent: 3922663 (1975-11-01), Lubke et al.
patent: 3949353 (1976-04-01), Waters et al.
Buller Paul L.
Chapman William L.
Fowler James C.
Thomas Bobby J.
Birmiel Howard A.
Gardiner Donald A.
Sadowsky Gersten
The United States of America as represented by the Secretary of
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