Nothing new under the sun
The history of invention is littered with concurrent developments – Newton and Leibniz can both be credited with calculus – and products out of time: da Vinci's helicopter, but also the patent for the fax machine, and I think the Chinese have a long list of stuff they came up hundreds of years before anyone else.
But sometimes what only matters is being in the right place at the right time and you are Bill Gates and I claim my £5.