Search Results for: Machine tool for working wood
the patent act of ( stat. ) into law proclaiming that patents were to be authorized for "any useful art, manufacture, engine, machine, or device, or any improvement therein not before known or used". [ ] on july , , samuel hopkins of pittsford, vermont became the first person in the united states to
, farmers built inferior versions of their own which led to the increasing need for african-american slave labor. [ ] wheel cypher jefferson's disk the jefferson disk, or wheel cypher, is a cipher system for encrypting messages and used as a deterrent for codebreaking . using wheels, each with the letters...
https://en.wikipedia.org/wiki/Timeline_of_United_States_inventions_(before_1890)