When I was a kid, where I lived, all chainsaws had bows. There was a rack made up above the cab of the pulpwood trucks and you could see the saws up on the rack when the tag axle truck went by with a load of pulp wood setting cross ways.
The only chainsaw I was around early in the 50's, that wasn't a bow saw, was a 2 man McCulloch that the tree service guys were using to fell and buck a tree. The guy swinging on the rope had a hand saw. No bucket trucks.