Con-pilot- the VC10 had slides that I seem to recall dropped down from the ceiling over the doors, was attached by a girt bar to the floors then thrown out and inflated. I suspect the VC10/707 60s era was the first of the inflatable slides. I'm not sure what the Trident had but I'm sure it worked better and totally automatically! Up until then I think the first 2 crew down the escape rope probablystretched an apron out outside, but I can't imagine this working very well!