What we think of as new has probably been done before if you take time to search for it. Google patents is the easiest way to search the USPTO content. We use patents as a time stamped proof of design activity which is of course traceable and a legal document.
Some Mobile Elevating Work Platform History
The MEWP (mobile elevating work platform) is called a number of different industry names including "Cherry Picker" "Boom lift" and "Scissor lift". There are many different types of designs intended for all the different industries that require mobile aerial working.
The machines obviously need to be mobile and take a person or people and their tools upwards to their particular required working height.