Search Results for: Carbon brushes used for electrical purposes
for concrete aggregates, for road metalling whether or not treated; macadam of slag dross or similar industrial waste granules, chippings and powder, of stones of heading no. or whether or not heat treated pebbles, gravel, broken or crushed stone, of a kind commonly used for concrete aggregates, for
for writing, printing or other graphic purposes, printed, embossed or perforated other paper and paperboard of a kind used for writing, printing or other graphic purposes trays, dishes, plates, cups and the like, of paper or paperboard printed books, brochures, leaflets and similar printed matter, whether...
https://amchamtt.com/resources/Documents/Trade%20Agreements/TRADE-AND-ECONOMIC-AGREEMENT-BETWEEN-CARICOM-and-CUBA.pdf
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
] 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 wheel cypher in . falling in and...
https://en.wikipedia.org/wiki/Timeline_of_United_States_inventions_(before_1890)