AD. In Europe, books were written manually (手动地) until the 15th century when Gutenberg invented the printing press in Germany. Since then, many books have been published around the world. For many people, one of life’s greatest pleasures is spending a few hours looking through the books...
BACKGROUND OF THE INVENTION Many different types of printing have been invented, a large number of which are presently in use. The known forms of print have a variety of methods for marking the print media with a relevant marking media Commonly used forms of printing include offset printing, ...
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When humanity first used fire is still not definitively known, but, like the first tools, it was probably invented by an ancestor ofHomo sapiens. Evidence of burnt material can be found in caves used byHomo erectusbeginning about 1 million (and maybe even 1.5 million) years ago. ...
After thousands of trials, American inventorThomas Edisongot a carbon-filamentlight bulbto burn for 13½ hours. Edison and others in his laboratory were also working on an electrical power distribution system to light homes and businesses, and in 1882 the Edison Electric Illuminating Company opened...