That's Vern Estes test firing an engine in a thrust measuring device. He designed it, the company was under Gleda's name. Putting it under his wife's name might have had something to do with a "No Compete" clause with Damon. Just a guess on my part.
The engine test company never went anywhere, as far as I know.
This is so cool because a photograph of this event appeared in the Nov/Dec 1975 issue of Model Rocket News. Now I get to see it in color!
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