- reading magnifier
- 读数: indication; playback; regist ...
- 放大器: amplifier; pantograph; lawnm ...
- 罗经读数放大器: compass reader; compass reading magnifier; compassreader
- 双重读数放大器: dual sense amplifier
- 读数放大镜: estimation of seismic intensity; magnifier for reading; read glass; reading glass
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