But I thought you were trying to claim that the two dispatchers' timepieces were synchronized.
After the 12:35 time call on both channels, Capt. Souter calls in advising "Do not use Industrial".

Both radio operators, repeat "Do not use Industrial" both with the 12:36 timestamp.

And again at 12:45 both dispatchers with their own slight variations, broadcast a description that is very very close to Oswald

JohnM