Does anyone know where this spanner comes from ?

[rustyric]

it says BT & Co. on it.

[rustyric]

So I have beaten you this time 

[turnnut]

 do not count the members out just yet, it has only been one day. thank you.

[Papaw]

Google shows a couple that are connected to St. Catharines, Ontario-based ETF and another unknown firm, BTCo.

http://progress-is-fine.blogspot.com/2018/03/bt-co-etf-wrench.html

[skipskip]

looks like a gas bottle wrench??

Skip

[strik9]

Most like that were torch wrenches.  I have a couple like that.

[rustyric]

If that is a lines man wrench in  the other picture/post/link then their maybe a link, because here in the UK B.T. is the name of our National phone company.

[gibsontool]

If that is a gas bottle wrench I don't know where you would use the box ends,if your rigging up a cutting torch all of the connections need an open end. If your gas welding the box ends will work if your changing the tips but I don't recall ever seeing tips with with that big of a nut. If you could tell us the size of the wrenches that might help,all the oxygen and act guages that I've ever used have about a 1" or 1 1/8" nut that connects to your cylinder and none of those openings look that big. Could well be that it is a gas bottle wrench for some other application maybe medical or whatever.