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Mullard PM252 box

PM252 exhibit
    
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The box is 70 mm square and 135 mm long. The valve was secured within the carton by means of an inner cardboard liner. The PM252 was introduced in 1927 and improved in 1929 and again in 1931. The 2 V 0.4 A filament rating dates this to the 1931 version.

 

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