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.
Ralph D. Thomas PI Vintage Collection
THOMAS INVESTIGATIE PUBLICATIONS, INC.
NATIONAL ASSOCIATION OF INVESTIGATIVE SPECIALISTS, INC.
SPY EXCHANGE AND SECURITY CENTER
P O Box 82148, Austin, Texas 78708
Showroom: 9513 Burnet Road, Austin, Texas 78758
Phone 512.719.3595 Fax 512.719.3594
BY THE STATE-OF-THE-ART COUNTERMEASURES SHOP!
To The Spy And PI Vintage Pages
2006, Thomas Investigative Publications, Inc. All rights reserved.
Thomas Investigative Publications, Trademark, 1981.
National Association Of Investigative Specialists, Inc, Trademark, 1986.
Spy Exchange, Trademark, 1999