Sentry projects in Elementary Electronics Magazine.
 

While cleaning out this weekend, I found a small collection of
printed circuit boards that I got from Elementary Electronics 1967-68.
They're not really worth anything, but it would be fun to know what
they are. I can't find them using Google. The dates are scratched on
the boards and the names are part of the etch.

1: Sentry Multivibrator, May 1968
2: Sentry Lo-Frequency Oscillator, March 1968
3: Sentry Hi-Lo Bander, July 1968
4: Looks like a wireless mic, no name (has 9V, ANT, SW and MIC on
the etch), Sentry, Nov 1967

These were distributed via blister pack (IRC).

Just curious.

Steve.
--
Steven D. Swift, , http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA