California was ground zero for aerospace and space, so whenever motors would show up from amateur rocketeers trying to lean into the consumer rocket market, we would lean into reminding them of the motor standards adopted by NAR to allow for a great safety record. Companies that started around there include:

Internal Ballistics
Composite Dynamics #1 (Hoffman)
Composite Dynamics #2 (Davis) *
Aerotech *
U.S. Rockets *
Composite Distribution
Bartlett
MPC *
Cox *
Plasmajet *
Crown (WA) *
Small Sounding Rocket Systems (WA)
ACS-Reaction Labs (KY) *
Ace *
California Model Rockets
Hypertek (Smalley)
Hypertek (Kline) *
Powertech *
Dynamic Propellant Tech
APS
. . .

* Eventually had certified motors.

Of course CA chased them all away too with excessive regulations.

NAR was hostile to larger motors than F until about 1986. TRA while they allowed larger motors around then and a bit later, were hostile to rules, and welcoming all vendors. They tended to try to take over clubs like the BORG and declare "fortunate sons" in particular vendors, and when that flipped it was without notice or cause.

As such at least 6 major motor vendors willing and able (ACS, USR, PT, Vulcan, Plasmajet, DPT, others) were killed from the consumer HPR market. The top-down control metric also reduced HPR participation from 20,000 in 1990 to a low of 1500 around 1998 and now back up to about 5000 in 2015, albeit with an iron fist as to who gets to play. The current system is evil (maliciously drafted) IMHO.

Jerry