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| 直角仪; 直角镜 | |||
| 直角转光，旋光器 | |||
| 光直角定规; 直角旋光器 | |||
| 直角转光器; 直角旋光器; 光学直角器; 光学角尺; 直角器 | |||
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| 直角转光器; 直角旋光器; 光学直角器; 光学角尺 | |||
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optical square : 18 phrases in 1 subject |
| Technology | 18 |
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