Bulb and holder for electron microscope

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  Electron microscope bulb on stand
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  Electron microscope bulb on stand

  

  Electron microscope bulb
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  Bulb from an electron microscope with holders for both terminals (both screw fitting)and stand with insulator. The only markings on the bulb are "738C" round the larger terminal at the end. Filament intact. Bulb 18cm long by 18cm wide measured along longest side-arm. After exposure to light it glows strongly in the dark for some considerable time. Date 1960s?

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