Military Grade Transmitter-Sender/Receiver
After World War II, there was a massive amount of military surprise equipment and private-eyes where quick to purchase gear they could use because it was cheap. The above is a military grade transmitter receiver. You could receive audio and send audio on it. They could be used as high grade walkie talkies and as bugs (which wasn't illgal at the time)

From The 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
Email: RThomas007@aol.com

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