Old lorry 'driving experiences'

I didnt realise power steering was available so early , when did it first become an option. I wish I still had the Foden I drove with the 320 Gardner and 9 speed Fuller . Ok before you all start I know its a modern motor but it was a great vehicle. I would love to drive any AEC but a MKV MM8 or an Ergo Mandator would be my choice