Bell Alexander Graham

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1. Scottish-born American inventor of the telephone. The first demonstration of electrical transmission of speech by his apparatus took place in 1876. Bell also invented the audiometer, an early hearing aid, and improved the phonograph.
贝尔，亚历山大·格雷姆：(1847-1922) 苏格兰裔美籍电话发明者。1876年他用他的装置第一次进行了电传导讲话声音的表演。贝尔还发明了一种早期助听器听力计，并改进了留声机