US PATENT SUBCLASS 455 / 67.2
.~.~ Using a chamber (e.g., room testing or audio surveillance, etc.)

Current as of: June, 1999
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39  DF  TRANSMITTER AND RECEIVER AT SEPARATE STATIONS {14}
67.1  DF  .~ With measuring, testing, or monitoring of system or part {6}
67.2.~.~ Using a chamber (e.g., room testing or audio surveillance, etc.)

DEFINITION

Classification: 455/67.2

Using a chamber (e.g. room testing or audio surveillance, etc.):

(under subclass 67.1) Subject matter wherein the measuring, testing, or monitoring is conducted in a confined housing or in a relatively close location.

(1) Note. For example, method or device for locating an intermodular or interference source in a close proximity to a desired transmitting source, or detecting the presence of a hidden transmitter, e.g., eavesdropping device.