Selective proximity detector

Details Selective proximity detector Selective proximity detector

1985-07-10

1987-03-24

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

Responsive to intruder energy

102215, 102427, 181401, H04B 100

Patent

active

046530355

ABSTRACT:
Geophone apparatus for receiving seismic signals due to an approaching vehicle, and giving an output when the signals are those characteristic of a heavy vehicle.

REFERENCES:
patent: 3585581 (1971-06-01), Aune et al.
patent: 4468763 (1984-08-01), Braunling et al.

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