If it is a good invention and actually works, then it will only sell if you see someone famous, or have enough money to advertise it. If it is a bad invention, don't count on selling it.
Patent
Blaise Pascal lived long before the invention of calculators.
I don't know loblolly
It took a week to a month by mail.
It took 5 years. 1850 to 1855
When you have an invention, the first step is to get a patent for the invention.
Make a trip to their office and tell them your invention.
1 month
One weekend.
Kevin wanted to sell it.
patent
No, it was an invention to sell books and magazines.