Helm & Hahn Co.
| Country | |
|---|---|
| City | Pittsburgh PA |
| Era | c.1934 c.1950, c.1943 |
Description
c.1934 – c.1943: Manufacturers Building Pittsburgh PA
c.1950: 530 Duquesne Way Pittsburgh 22 PA
Rings & Mountings
| Country | |
|---|---|
| City | Pittsburgh PA |
| Era | c.1934 c.1950, c.1943 |
c.1934 – c.1943: Manufacturers Building Pittsburgh PA
c.1950: 530 Duquesne Way Pittsburgh 22 PA
Rings & Mountings