Stoelting Portable Polygraph, 1970's
One of the problems with polygraphs of the 1960's and 1970's is that they were heavy and bulky. Stoelting attempted to solve that problem by releasing this portable unit. Measurements where 15 1/2 X 9 X 4 1/2 inches deep. It didn't have all the advanced features of the bugger units but it worked well.
You can review other antique and rare polygraph machines at the below web site:
Polygraph
Instrument History
Sponsored by Decker Instruments, this place has photos and descriptions
of very old polygraph machines.
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