Hobson number 230 spark plugs

[chris52]

I found these spark plugs in our store at work. All I can find out about them is that they are roughly from the mid 30’s does anyone know anything more about them.
Cheers Chris

[Jediworrier]

https://collection.sciencemuseumgroup.org.uk/peopl...

https://www.gracesguide.co.uk/H._M._Hobson

Edited by Jediworrier on Wednesday 27th May 18:02

[chris52]

Many thanks it would be interesting in finding out what car truck etc they were used in.
Chris