Cold Propellant Model Rocket Safety Code

In the blog comments, a question came up about substantial metal in a Vashon model rocket.
Tom's comment: 
"I was under the impression that metal body tubes weren't allowed . . ."
My response:
"I think the Vashon aluminum rockets got a "pass" from the NAR. Back then you couldn't get BP model rocket engines in California and a few other states. The liquid propellant Vashon rockets were our only choice. The NAR even had a cold propellant safety code." 

To see it in the Vashon catalog: CLICK HERE