英语词汇“printing key frame”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	printing key frame
释义	printing key frame now historical noun A typewriter for producing embossed type, designed for use by blind people. The device was patented by Pierre Foucault in 1849 and was exhibited in London at the Great Exhibition of 1851.. Origin Mid 19th century.
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printing key frame