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Comprises a borosilicate glass U tube with 225 mm. height, with each limb graduated 0-120 x 1 mm. Bend fitted with a filling tube and stopcock. Two platinum electrodes 14 mm. diameter can be adjusted at any position by locking

PM-548 ORBITAL MODEL SET

Depicting nucleus and outer orbits KLMNOP with electrons in an
acrylics case for primary students

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