![](https://coimages.sciencemuseumgroup.org.uk/50/736/medium_thumbnail_e2013_442_1__0001_.jpg)
McVitie Weston valve collection, Louden valve, type F2
- Made:
- 1924
![Louden valve, type F2](https://coimages.sciencemuseumgroup.org.uk/453/541/medium_smg00262930.jpg)
Louden valve, type F2, pip and top of glass envelope painted blue, (RMW/B140 - McVitie Weston number), by Unknown maker, 1924.
Louden valve, type F2, pip and top of glass envelope painted blue, (RMW/B140 - McVitie Weston number), by Unknown maker, 1924.