Even motorized pedal bike can be called a hybrid vehicle in a way. But nowadays when we talk about hybrid cars we usually have hybrid electric vehicles in mind.
He was able to develop any invention in his imagination from scratch to complete machine. Tesla usually envisioned a project of machine, put it into motion, leave it for some time, and only come back to it later to check if it’s working properly.
Tesla (truth radio inventor) was working on a huge project that was going to supply whole humanity with free electricity. Today we can buy instructions in form of an e-book that tell us step by step how build small free energy generator for home use.