On the street side, one of the first ambulance-to-hospital EKG and voice systems used by paramedics was the Motorola C.O.R. system, which consisted of a UHF vehicular repeater and 2-handheld combo. This was followed by the self-contained "orange box" models... the Biophone (used by Squad 51 - and many others) and the Motorola portable (yeah, right!) C.O.R., the latter being eventually replaced by the much smaller and lighter APCOR radios.