![](https://coimages.sciencemuseumgroup.org.uk/58/890/large_thumbnail_1991_0166.jpg)
McVitie Weston valve collection, Marconi WT Co Catkin valve, type MPT4
- Made:
- 1935
![SMG00313399](https://coimages.sciencemuseumgroup.org.uk/491/972/small_thumbnail_smg00313399.jpg)
![Marconi WT Co Catkin valve, type MPT4, marked 36](https://coimages.sciencemuseumgroup.org.uk/486/581/small_thumbnail_smg00313399.jpg)
Marconi WT Co Catkin valve, type MPT4, marked 36, (RMW/Y667A - McVitie Weston number), by Marconi Wireless Telegraph Company Limited, 1935.
Marconi WT Co Catkin valve, type MPT4, marked 36, (RMW/Y667A - McVitie Weston number), by Marconi Wireless Telegraph Company Limited, 1935.