Well it goes like this, these callipers with built in handbrake mechs were designed by Girling, Lucas bought that part of the business over and then some time later Lucas was shredded up and TRW bought over the brake side of the business.
So, yes they are Girling/Lucas/TRW and I'd doubt if there is any maker's markings on them.
Edit:- oh, and if anyone talks to you about ATE or Teves systems, they are both the same thing, ATE = Alfred Teves, just another useless fact?