McVitie Weston valve collection, GEC Osram valve, type R.4A
- Made:
- circa 1918
- maker:
- GEC (Osram)
This image is released under a CC BY-NC-SA 4.0
Licence
GEC Osram valve, type R
Science Museum Group
© The Board of Trustees of the Science Musuem
GEC Osram valve, type R.4A, (RMW/B40 - McVitie Weston number), by G.E.C. (Osram), c. 1918.
