Thanks to Sir Watkyn's lead, here's a gem of an advertisement from the Gorham Mfg. Co. that shows that Gorham won a restraining order against F. & M. Weintraub in 1909 preventing them using marks that were considered too similar to those used by Gorham:

Gorham Mfg. Company - Providence, R.I. - 1910
This long-running mystery of the identity of those marks is finally over!
Trev.