John Rabone and Sons, Birmingham made folding rules.
Some were particularly specialised. This one maybe a boilermakers rule (scale for copper furnaces)
This is labelled
"John Rabone & Sons Birmingham"
It is not numbered.
It does however have some unusual scales
1) Copper Furnaces
Top, Sides, LTC B, Galls
2) Flat Iron
by 1/4in Thick
Also Square iron per foot
Has sliding vernier measuring in inches