... optical bevel protractor 光学量角器,光学倾斜... double protractor 双斜量角器 universal bevel protractor 万能量角器,组合角尺...
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double protractor detail 双量角器
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The double-sided protractor comprises two identical protractors and is structurally characterized in that a rotating shaft is arranged in the center ofthe two overlapped protractors.
本实用新型包括两个相同的量角 器，其结构要点是在上下两个叠加量角器的中心上设置有转轴。
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