So far your input is as useful as an ejector seat in a helicopter.
At least one Russian military helicopter has an ejector seat. It requires the rotors to be jettisoned using explosive charges first, I believe, but if you're bailing out then I suppose you probably no longer need them.
At least one Russian military helicopter has an ejector seat.
Two if you count the Ka-50 and Ka-52 as separate entities. Not that they seem to do much good, apparently the only aircrew who have survived hull-loss incidents in either type did so as a result of an unplanned ejection :-)
At least one Russian military helicopter has an ejector seat. It requires the rotors to be jettisoned using explosive charges first, I believe, but if you're bailing out then I suppose you probably no longer need them.