I dont know about that Ron. It might just be a matter of Semantics. I based my post on the Regs as I understand them. Nowhere does it say "flight test branches of aircraft manufactures"
What it says is:
"
§ 87.303 Frequencies.
(a) These frequencies are available for assignment to flight test land and aircraft stations:
123.175 123.225 123.400 123.200 123.375
123.450
(b) These additional frequencies are available for assignment only to flight
test stations of aircraft manufacturers:
123.125 123.275 123.425 123.550 123.150 123.325 123.475 123.575 123.250 123.350 123.525