That’s the original French version of a box wrench.
That style of wrench has been made in France since at least the 1930s.
The long end can be used similar to an old fashioned( but still occasionally manufactured) tubular Box wrench.
the bent end is made to be used similar to a modern box wrench.
The opening thru the bent end allows you to put a metal rod thru if you need to apply more leverage when using the long end socket for turning tight or stuck bolts/nuts.
The long end has a round profile due to the socket on the end, which makes it perfect for cheater pipes if you need more leverage when using the bent end.
The profile of the wrenches is round, which makes them more comfortable to use than the common “knife-edge” you find on a lot of wrenches nowadays.
Facom, and SAM Outillage, were the two major French manufacturers, although there were others such as MoB Outillage, and even Stanley sells them in France.
Beta tools from Italy seems to offer nice ones.
A bunch of Asian manufacturers also seem to make the style.
If you look at the design of the wrenches, they seem to be forged similar to a typical forged socket, were both sockets are forged into the ends at the same time.
I’m not sure that the wrenches even get or need a separate broaching operation after forging.
A groove is then milled in one end thru the socket, and that is heated and bent to the correct angle.
I presume the point of the design was that equipment set up to forge sockets could be used to manufacture these wrenches, and costs are saved making broaching cutters, and having to run broaching dies thru both sides like on a normal box wrench.