FWIW:
The blue owner's manual for my '71 Pantera references "HAND BRAKE". There is no mention or reference to an emergency brake.
I don't know when the term "EMERGENCY BRAKE"" was changed to HAND BRAKE", but I have Ford shop manuals as far back as 1965 that ONLY reference a "HAND BRAKE". The two (other) owner's manuals (2002 and 2016) that I have call it a "PARKING BRAKE". The 2016 Fusion that we have has an EPB and the symbol on the activation switch has a "P" in its center. None of these Ford or Pantera manuals state anything about using the "HAND BRAKE" or "PARKING BRAKE" in an emergency situation.
John