论文部分内容阅读
宁海县友谊无线电厂和光学仪器厂合作研制成功一种大视场工作镜,为钟表行业、电子工业和印刷行业的工作带来方便。这种工作镜的放大部分由一块长160毫米,阔100毫米的长方形固定透镜和一块直
Ninghai County Friendship Radio Factory and Optical Instrument Factory successfully developed a large field of view mirror for the clock and watch industry, the electronics industry and the printing industry to bring convenience. The magnification of this work mirror consists of a 160 mm long, 100 mm wide rectangular fixed lens and a straight