Laboratory glassware; Beckmann thermometers, adjustable range enclosed scale thermometers
实验室玻璃器皿；贝克曼温度计 可调量程封闭式温度计

1972-01-01

Laboratory glassware; straight enclosed scale laboratory thermometers for partial immersion
实验室玻璃器皿；部分浸入式直封闭刻度实验室温度计

1978-04-01

Laboratory glassware; enclosed scale colorimeter thermometers of 6 degC range
实验室玻璃器皿；6摄氏度范围的封闭式比例尺色度计温度计

1971-09-01