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.
随便看	empory empower empowerment empress empressement empressite empress tree emprise emprize emprosthotonic emprosthotonos emprosthotonus Empson, Sir William empt emptain emptily emptin emptiness empting emption emptor empty empty calories empty cell empty chair

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printing key frame