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A phosphorescent vacuum tube, the pear shaped bulb containing a mineral sample, with stem and mahogany stand - 13in.high; and a fluorescent vacuum tube on mahogany stand - 13½in.high

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A phosphorescent vacuum tube, the pear shaped bulb containing a mineral sample, with stem and mahogany stand - 13in.high; and a fluorescent vacuum tube on mahogany stand - 13½in.high
see Front Cover illustration (part lot) (2)
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