You are right, these stingers had been build for uranium research in the Iran 1976/78. There was much more equipment inside and outside the Bell 212.
You may read here:
http://downloadportal.prakla-seismos...eport_77_2.pdf Go to page 12.
Sorry, but the potos there are not colored.
Equipment and personnel had been evacuated from Iran in Operation Sandstorm in 1979.
This post belong to page 67