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Glass container that holds liquid with a valve on the bottom to allow small droplets of liquid to escape
0001-005-classes_science_f2-033 1969Glass container that holds liquid with a valve on the bottom to allow small droplets of liquid to escape
0001-005-classes_science_f2-032 1969Teacher using a scale to measure materials, students are watching
0001-005-classes_science_f2-020 1973
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