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Mullard DF.ORA box

DF.ORA exhibit
    
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The DF.ORA was issued in 1924. This box is of two part construction with the two halves sliding together. The inner protection is provided by corrugated card and horse hair. It is probable that the original inner structure was card with a central space for the valve. The box is 70 mm square and 117 mm tall.

 

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