[Drake] Keyer

[Bill Gaines AD8P]

I am resurrecting a C Line and am gathering assorted "extras" that came at that same time. I have found a nice MN4 and a Drake desk microphone (not sure what that is used for) but I find I am in need of a keyer. My last 2 rigs were Ten Tec which have built in keyers. The question is, did Drake build a keyer for the C Line and if so does anyone have one for sale? I know they built one for the TR7 line but I want something that goes with the C Line if they made one. I have been a ham going on 50 years and I am allowed to forget what was built "back in the day". If Drake didn't build such a thing what do you suggest? 

Thanks

Bill AD8P