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据报道一种无内部光源的光能电话已在西门子联合股份有限公司的慕尼黑实验室研制成功。在这种西门子样机中,带有一块反
It has been reported that an optical telephone without an internal light source has been successfully developed at the Munich Laboratory of Siemens AG. In this Siemens prototype, with a counter