RB Clifton Telephone Line Tone Sweep, 1960s
The RB Clifton telephone line tone sweep would send out a series of tones on a phone line to turn on any bugs wired to the line and then detect them with it's meter reading. RB Clifton manufactured countermeasures gear ad bumper beepers out of Florida in the 1960's and 1970's and was one of the major international companies for such cutting-edge products for it's time.

From The Ralph D. Thomas PI Vintage Collection
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