Unknown maker on imperial telephone set

[JensF.]

Hi,

I borrowed this pic of a makers mark from the book of Somers. Which maker was "RB"?

[JensF.]

Nobody has got an idea?

[JensF.]

Still nobody? Could it be Robert Bosch??

[Chip]

Jens,

Unfortunately, I have not seen enough of this type of equipment to know who this maker is. I am more familiar with the names of the firms that manufactured the standard army telephone equipment.

Chip