can i work with h1 tranfer petiition receipt in my case?

My H1b with emp A starts from november 15 2012. I have an offer from emp B and they are doing h1 transfer. Since i have my h1 i-94 and h1 transfer petition receipt, can i work from nov 15 with emp B without joining A?

Yes, this can be done. You can check w/ B’s attorney to be sure.