WELSH MANUFACTURING COMPANY
Little research has been done into the respirators sold by the Welsh Manufacturing Co., as no original full-face designs made by them have ever surfaced. Below are a few of the more interesting examples of their masks, which consist mostly of MBU copies, and the occasional mask purchased from Davis.
Welsh, like many other companies, manufactured an MBU-13 copy, called the Model 7813, under license from Sierra. What is of interest is that the Bureau of Mines stamp located on the forehead of the mask (BM-1408F) was originally assigned to Davis, showing that Davis had, at some point, brokered an agreement with Welsh.
Further evidence for this connection exists, namely that the inner labels of the Model 7813's box depict Davis M2 masks, called "Twin Lens" in this context.
There also exists a Davis M2 hose mask with a Welsh exhale valve cover.
As a final nail in the coffin (although it may be mere coincidence), an orange MBU with Welsh mold markings (similar to those shown on the Model 7813) has been found. Could this be a final application of reserve stocks of Davis's signature orange rubber? I have my doubts, but the possibility exists.
WELSH MODEL 7813
ORANGE WELSH MBU
BM-1408F STAMP ON MODEL 7813
INTERNAL LABEL OF THE MODEL 7813'S BOX