McVitie Weston valve collection
- Made:
- United States and Canada
- maker:
- Mullard Limited
![Mullard valve, type PM3D, external as D45 [/631] but intact](https://coimages.sciencemuseumgroup.org.uk/453/325/medium_smg00262712.jpg)
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Mullard valve, type PM3D, external as D45 [/631] but intact, (RMW/D46 - McVitie Weston number), by Mullard Limited.
