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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
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 of the alphabet arranged randomly around them, thomas jefferson invented the...
https://en.wikipedia.org/wiki/Timeline_of_United_States_inventions_(before_1890)
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cixi, china ningbo tianyi electric appliance co., ltd prime food - karachi, pakistan this is in reference to supply of basmati, long grain rice & spices from pakistan zhejiang guanfeng food machinery co.,ltd. - shaoxing city, zhejiang province china always being customer-oriented, we not only widely used...
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