You didn't require to build a prototype, following that 1900 history. That is all I have a timeline schedule. Not Simon's singing choir?

You don't run around, and landing a New environment, and sleeping in that Home Depot across my library, they have some flyers if they have a job, or seminar, or book gathering. You know....you check the local town activities. 

The inventor's jobs like the material science always required a Prototype to be built. 

If you are in the mechanical science, that is an assure thing you know you built a prototype. With the publishing business, you don't need to a prototype. My circumstance is different.  You imagine you just built a prototype by hearing?! How great !