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carbon ball press machine kit

Copying Machines Used to Make One or a Few Copies of New Documents, Mainly Outgoing Letters: Letter Copying Presses A few alternatives to hand copying were invented between the mid-17 th century and the late 18 th century, but none had a significant impact in offices. In 1780, steam engine inventor James Watt obtained a British patent for letter copying presses, which James Watt & Co. produced ...

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