..."The Elisha Gray and Alexander Graham Bell controversy concerns the question of whether Gray and Bell invented the telephone independently."

P.S. In order to date the invention or discovery, the simplest way is to post to one's own address; it gets dated - if "war" about who first ensues later.

Invention can be at "ideation", "theoretical" or "Practical" level but for patenting it should be a marketable product or at least associated with a marketable product.

Salman Rushdie could get his otherwise non-marketable expression "Naughty But Nice" by associating it with advertisement of a cream chocolate.

Einstein could not get his equation E=mc2 patented because it is a concept. But, he could get his blouse design patented because it is a marketable product.

https://en.m.wikipedia.org/wiki/Elisha_Gray_and_Alexander_Bell_telephone_controversy

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