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Mullard PM4 box

PM4 exhibit
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The PM4 was issued in 1925. This carton is top opening with a tuck-in flaps to hold the valve below the top of the package. Inside the box is a shaped card liner. Inside the box was a piece of printed card defining the service and quality of the brand. The list of patent numbers suggests late 1920's. The box is 70 mm square and 132 mm tall.


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