Myke Berganske was MRI, went to MPC who also brought G. Harry Stine onboard as a designer and consultant, and then bought out the MPC line to sell as AVI. AVI still owes me money, but that is another show.
I was a member of the NAR's Standard and Testing Committee when Myke brought the MPC Mini-jets in for certification testing.
One of AVI's most unique products was a newspaper print catalog - Galactic Encyclopedia, IIRC - featuring all sort of rocketry products, tools, other hobby stuff, and even doll houses. My rather used and fragile copy is buried in a box somewhere.
I have an MRI Theta 37 kit and a Zenith II kit.

Chas

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Charles Russell, MSgt,USAF (ret.)
NAR 9790, Lvl 1
SAM "Balls Three"